Form 7206, Schedule D, and SEHD not calculating correct?

Taxes were inputted into TT.  The note at the bottom of Form 7206 had what I believe is the correct amount for the self employed health care deduction.  This amount shows up on Schedule 1, line 17. All good.

 

I got a 1099-B for a small, $25 MF sale (Vanguard Fee) that has a gain of $19.63.  This is my only 1099B.  I add it into Turbotax and my refund drops by $630.  That can't be correct.  I chased it down and the non-transparent calculation on Form 7206 for the SEHD is now $2,083 lower.  Something is not right here.  Any thoughts on how to fix this.