I also have the problem. This is 100% a Sonos issue. I have the same library connected to my S1 system and it’s fine. No dupes, no missing tracks. The same library that I have been using and adding to since 2006. 
 

Last man / woman out please switch off the lights. 

Thank you for posting this (I am replying in hopes that the more replies there are, the more likely sonos will address it…?) :-)

I’m having a similar issue - at least as it comes to compilations / soundtracks /etc. I’ve carefully tagged albums with tracks by different artists with a single Album Artist. It seems as though the indexing is ignoring the Album Artist tag and jumping to the Artist tag for each track and sorting it as though it’s its own album (or something like that).

Boggles the mind how they’ve made a mess of this core functionality - one I’ve been using on Sonos systems for 15 years or so. I’ve invested hundreds of hours of work in curating, tagging, and managing the data on my local music library, and now it’s a complete and utter mess (granted I’ve been using it all less since it’s such a pain to scroll to a band with a name that starts at the end of the alphabet).

Uunfortunately it's not just compilation albums

It does seem to relate to compilation albums for me. One shows up 60 times which makes scrolling through a challenge! Hope there is a fix soon…

Every track (around 38,000 songs) I have from my own album collection is fully annotated with all metadata.  In iTunes, everything is correctly listed and categorised.  I use  iTunes as the master application for verifying every song/track is correct, before I copy the content to my NAS and update the Sonos Music Library through the Sonos PC app.  It’s not a metadata issue for me, it’s Sonos - plain and simple!

Steve

I have the same problem, multiple copies of the same album, up to 10 or 12 copies, and when you click on them to see the contents they are all in the same jumbled order, maybe track 8, track 6, track 1 etc. However, the whole album is there. It appears that the problem is with compilations predominantly but not all the compilations.

It also means that not all of the albums show under a particular artist. So I have about 30 or so cafe del mar albums and only about 10 of them show on the iOS app. However, if you go to the Mac os version then they all show but still got the multiple copies.

When I have checked my NAS drive, they all appear normally, no multiple copies and if I stream on my Uniti Atom, they appear in the Naim app exactly how they appear on the NAS drive.

Pre 16.3, even with all the app problems, this did not happen. it is only since the upgrade that I have experienced this. Hope there is a fix soon as this is very frustrating.

@BrianWarrington @callmefrank .
FYI: Sonos latest firmware version 16.3 has a known issue with compilation albums where they appear as duplicate albums when browsing your Music Library by album.
See thread below and confirmation of it being a known problem by @Corry P from Sonos.
Unfortunately no given ETA for a fix. 
 

Ross.

It’s not like you can put the mis-indexed songs into something like, I don’t know… a queue… where perhaps you could put them in the order you want… now there’s a radical idea… 

I have the same issue!   So tried of all the issues this year!   I don’t care about all the new products with Sonos is the going to keep up the base app.

I have same issue, using 16.4 beta windows 11 and android app. so no fix as of yet

Glad to see I’m not alone.  I was so happy to finally get my local library back onto Sonos.  Some artists and albums are well organized, other albums show up as many as four times.  And random tracks are out of order, despite the correct numbering on the CD and in iTunes.  Like a lot of you, I value my library and have curated the hell out of it for consistency and clarity.  Seeing the new Sonos app totally wreck it is both incredibly frustrating and, after all the aggravation the last couple months, totally unsurprising.  

 If the Artist tag & Album Artist tag are not exactly the same 16.3 screws it up.  I normally tag compilations with the performer for the Artist tag & Various for the Album Artist tag.  So my compilations are a mess.  Hopefully Sonos will fix this soon.

 I learned long ago to match Artist & Album Artist tags ( with the exception of compilations ).  Makes it easier to find the artist you want.  This is very important for classical albums where the default tags are all over the map.

I have the same problem v16.3.1. It used to work as expected before this recent update. The controller software has now been made even worse by this latest bug.

Similar problem that affects (so far) only latest addition to my Sonos library: A new double album I just bought in iTunes (on Windows 11) displays as 12 albums in my Sonos S2 controller, each one with the 14 tracks listed in the same scrambled order. My Android Sonos controller shows the album exactly the same way - duplicated and with the tracks scrambled.

All metadata is in order as far as I can tell; tracks show disc # and track # since it’s a 2-CD set.

My PC file system shows the album as a single folder. It appears as a single album in iTunes and in my MediaMonkey 5 music player.

My Sonos Windows controller is up to date: Sonos S2 version 16.3, build 80155014.

The Sonos support bot mentioned that “a Sonos music library has a 65,000 track limit.” My library has 8357 files (tracks) according to the MediaMonkey library listing.

Confirming that I have this same issue.

The music library is working for me (although album art only shows in the Windows desktop app, and not in the new Android app), however any compilation / various artists albums are shown multiple times when scrolling through the album list.

I’ve done “Update Music Library now” and the issue persists.

Same issue for me, any album which has the track artist different to the album artist gets duplicated as many times as there are different track artists associated with the album.  Sonos are really just a joke.  I wish I were rich so I could sue them, for ALL the broken functionality they've ben responsible for.

Yes, you are absolutely right. The issue is entirely driven by the SONOS app.   My library too is exported from itunes to my synology nas and also copied onto other devices via Isyncr. I link to SONOS via the y Synology.  SONOS destroyed my ability to play from my local library, partly repaired it (without album artwork) and have now screwed it up again.. I despair. 

So Sonos, is this ever going to get fixed? I spent approximately £7000 on our Sonos music system, and for the last few months have been unable to play a large percentage of albums from my music library, I think because of this bug. The fact that it updated in the background to something completely broken makes it feel like consumer lawsuit territory, especially combine with the app debacle. Come on, just get it fixed 🤬

I’ve realised that isn’t just compilations but any album having a track listed with a feature or guest artist. That’s why some of the non compilations are duplicated (I think!). It doesn’t answer why random tracks are missing though.

It is a real nuisance

I bought and downloaded another album today, partly to test whether the problem I reported yesterday was a one-off. It was not.

The new album shows in my Sonos library in two identical copies, identically scrambled:  track numbers run 1-6-2-3-4-5, no problem for me since tracks 1 and 6 are standalone pieces while 2-5 are a set.

Sonos happens to list today’s tracks in alphabetical order but yesterday’s album tracks are not, so that doesn’t seem to be what’s happening.

I have to assume that the most recent Sonos update is causing this problem as it’s never happened before in years of adding albums to Sonos.

joining this thread - FINALLY got my NAS reconnected and now this issue. Following for a fix. 

Sonos truly used to be a SUPERIOR system and my set-up was killer. What a massive let down this last year has been. 

The Sonos firmware programmer must be on holiday, or quit...

This issue has been a problem for many Sonos customers since July. No idea why a fix hasn’t landed yet???

Seriously, it makes me wonder how big their development team actually is and whether they understand the code base they are tasked for changing. My guess is that the original developers are well gone and the current bunch are simply not up to the task. Prove me wrong….please!

Ross.

I didn’t have a problem reconnecting, but the newly built library has as many duplicates as the old one! I see the Sonos director is apologising for the failed update - I guess we’ll have to wait for a proper fix. As a side-gripe - I hate it when they update the Android interface - it was much better and easier to use in its previous version.

Yes, thanks for your reply. On further investigation it looks like there may have been an issue with some file corruption during a power outage around the same time that created a few 0kb files. Good news is I had backups and now a UPS on my server. Unfortunately it came at the same time as the Sonos issue with the library. So in this case Sonos weren’t responsible for the 0kb file issue. Well apart from all my compilation albums now having loads of individual albums. Thankfully I’ve been able to get round to using the folder option which is not ideal but does allow you to play compilation albums in one piece. So in this case, sorry Sonos (bet they don’t see that often). :-)