File corruption - but file works fine - how can I fix?

Here's the error message:

Measure 45, staff 17 incomplete. Expected: 12/8; Found: 42/16
Measure 46, staff 17 incomplete. Expected: 12/8; Found: 48/16
Measure 47, staff 17 incomplete. Expected: 12/8; Found: 42/16
Measure 48, staff 17 incomplete. Expected: 12/8; Found: 42/16
Measure 50, staff 17 incomplete. Expected: 12/8; Found: 18/8
Measure 51, staff 17 incomplete. Expected: 12/8; Found: 42/16
Measure 52, staff 17 incomplete. Expected: 12/8; Found: 42/16

By eyeball it looks fine. Counting down in "edit instruments" the cello is #17 in the list (not sure if that's how to determine staff #?).

I've been working on this score most of the week and doing an insane amount of copy/paste/explode and manually deleting a lot of extraneous rests that came in that section because the original was written with all strings in the cello part, so I alternated between exploding and manually editing each measure for each string instrument to give it the proper notes. Not sure if that is the issue.

Anyway, how can I fix this? I've worked with corrupted files before, but there's a ton of work in this one and I still need to edit. Was about to send to the conductor for first review but I don't want to risk destroying the file (yes, I immediately made a backup but of course that has the same corruption).

file attached. Thanks in advance!!