OK - so, I went into the forms view and drilled down to where the 6,500 was applied (Keogh/SEP Wks, III.17 Allowable catch-up contributions) and that linked to part III.8 which states "Note: The program will automatically calculate the allowable elective deferrals to your Individual 401(k) if you have any entries in Part I, line 6.
Sure enough, the checkbox in Part I, 6f (under Individual 401k) was checked! Once I unchecked that, the maximum adjusted down to remove the catch-up contribution.
So now the mystery (on my end) is how that checkbox for 401(k) got checked during the interview process. It's a mystery to me, but at least I understand what went wrong.
It is, of course, possible that I somehow did something that led to that outcome, but I sure don't know what it was as I never filled anything out related to 401(k) since I've never had one.
