That’s unusual, for sure. Have you tried a power cycle (unplugging all the speakers from power for two minutes) on these? It sounds like they aren’t properly syncing as they should, I would think a refresh of all the electronics inside might help.
I’m experiencing something similar. When we bought the Sonos system then Bluetooth was having issues and the turn table had to be connected via line in. Now it seems the Bluetooth is working. It’s almost like one of the pairs is connected via Bluetooth and one via line in. There’s about a 10 second delay in the audio from one pair of speakers to the other
