Also asked on the FB group: Michael Seltenreich
This happened to me once in a piece where I had multiple independent time signatures. Could that be the issue?
YES! That’s exactly my case! Did you manage to fix it? All the other parts are fine.
Unfortunately I couldn’t fix it! I think I ended up keeping everybody in the same meter, but this was back in 2018.
Ended up changing them into plain Numbers rather than bar-numbers, and inputting the number manually.