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I'd agree with the idea that it sounds like a corruption.
Have you tried reindexing the fields in the table, or compacting the database?
I installed Filemaker Pro Advanced 12.0v2 and the problem went away.
Just keep in mind, it can happen again
importing into a clone of the file should reset it
> I installed Filemaker Pro Advanced 12.0v2 and the problem went away.
Greg's suggestion will definitely fix the issue.
From great experience of recovering files with bad data and building on top of them because they 'seem' fixed, i would also recommend you do this.