"Do you pay the interest MN charged them"

If you're meaning does Intuit pay it, no, they wont.   I think their stance is....As a professional preparer you're supposed to review the return for accuracy, not rely blindly on the software.

I havent seen any other posts concerning this issue, seems that many others would have noticed it by now, maybe it was an issue early in the season and got fixed at some point?  I'll tag a mod and see if theyve seen this addressed previously.