I’ve seen older topics on this issue, but they were closed and it’s still occurring. Seem to be a few people experiencing this too.
When the Sonos alarm starts, often it plays the wrong station, and the display says both the correct station and wrong station. Sometimes it does play the correct station.
I have mine set for BBC Radio 6, but sometimes it will play BBC radio 2 or radio 4.
This is using the Sonos radio app.