The only thing I can suggest here is to review your entries because it does seem like something is entered wrong. There have been no other reports of math errors on the form and I have not encountered any with my testing myself.
Go back to your K-1 entry and progress through to the Form 7203 screen and ensure you have not entered any amounts into line 3m or 13 that are not duplicates of the other lines. Be sure to click Refresh Calculations before you Continue past the page.
@ESG S-Corp
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