It can also come form from a form K-1 if you entered one of those.
Also some forms 1099-OID, but for that form it would have to have had an entry error on the -OID form to be that high.
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or perhaps this.....
The interest income "summary" alongside the 1099-INT Interest Income line, on the software menu page (not on the actual form 1040) that includes box 1, 3 and 8 added together...not just box 1.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*