Hard to know exactly why...but mine does it too IF:
1) IF, box 17 has 0.00 in it and no state is indicated in box 15. If your box 17 has a zero in it, then make boxes 15, 16, 17 entirely blank.
2) Will also occur if you have a positive value in box 8, and you didn't indicate what state(s) issued the $$ showing in box 8...then you need to run thru the interview and answer the followup page as to what states issued those box 8 $$. IF none of the bonds you hold are from your own state's municipal bonds, or if you live in a state without an income tax, then just mark it all as "Multiple States" (end of list of states) .
3) Could be something else, but don't put 0.00 in any boxes that don't have actual values in them...leave them blank
( the only exception to #3 that I know of, is for a 1099-DIV form, where the software requires that box 1a of that form must have either a real positive value, or a 0.00 in it)
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Beyond that, failing all else, delete that particular 1099-INT form entirely and create a new form, but enter it from scratch, manually...do not import it from a provider.....use "I'll type it in myself" on the page where it asks for the bank name