Ninox Database for Mac - New Entries not Saving

I have Ninox Database for Mac (3.7.6) running on a MacBook Pro laptop with macOS Monterey 12.6. 

I have a large “Home Inventory” database with 859 items, that will no longer save any new entries. As long as the database is open, it retains the entry, and even sorts it alphabetically. But when I close the database and then re-open it, the entry is gone. 

Something must have happened yesterday, because entries from 2 days ago are still there. The good thing is that I tried creating new entries in some of my other databases, and they all work fine, so it is only this one database that has the problem.

Is it possible that this one database is corrupted? Is there a way to move all 13,744 cells of information (and individual photos) from this database, to a new one?

Any tips would be appreciated.

Thanks!