I probably can't tell you for sure without poking around in the document, but there are two things I might have tried. First, if you append the styles from the good doc to the bad doc, you would know for sure that it's just a styles problem, which you could then look for after you revert (just so you would know). If it didn't work, it's probably a bug, and in that case, I'd export as IDML and open that file to see if the problem is still there.
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