Note: this is a guess, but it may describe your puzzling issue.
Occasionally, a number in TurboTax gets "stuck". That is, a number is entered or generated, but when you go back, you can't see the screen any longer where this number was entered/created.
The only sure fire way to get rid of the number is to delete the object that it is in and then re-add the object. However, I don't have a clear way of figuring out which business is the "problem".
Is it possible that you entered the Health Care premium for one of the other businesses, then deleted it? If so, please delete that business and re-add it.
However, if you are sure that you never accidently added a health care premium to either of other two businesses, then let me ask you about something that puzzles me at the top.
You said, "On our joint return, we list three Schedule C businesses. We entered in the "step by step" for one business a health care insurance premium of $26,642. This gets transferred to form 7206, on lines 1, 3 and 14."
Then, later on you said, "In the PDF, the 53,222 figure appears only on that QBI worksheet, as well as the above-mentioned form 7206 and Sch. 1, ln.17."
So, did that 7206 have the 26,542 or the 53,222?
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