I resolved this issue shortly after posting this.
Here's what happened for those encountering the same problem:
I had a 1099-INT that I had automatically scanned in. The "other boxes filled in" was never checked as all those boxes were blank.
However, TurboTax for some reason *had* populated one of these hidden boxes (box 17) with information that was not on my 1099-INT. Clearing this resolved the discrepancy.
Check all hidden fields in your scanned documents to be sure it didn't slip anything in like it did for me.
