KarenZeff,
This does seem to be a bug. QBI is a deduction, i.e. a subtraction from your income, rather than a credit, a subtraction from your taxes. You can offset that $20 by putting in a -$20 other income labelled, say "Offset TurboTax QBI". Once my Desktop TurboTax finishes updating, I'll follow up with specific instructions for this workaround.
