Salaried Employee has exempt box checked but FWH $ still taken out why?

Exempt means "don't calculate tax using the tax tables", but if any "Extra Withholding" is entered, then there will be a tax of that amount:

Could that be what you're seeing?

This is desktop.  That's what I figured.  Scouts honor, the salaried employee has the exempt checked and still has Federal withholding.  Extra withholding is zero.  She did fill out a newer (2020 or later).  Could that have anything to do with this?\\

I don't know for sure. What happens if you change the numbers there to 0.00, maybe one field at a time, and then start to create a new paycheck?  Does anything change the tax calculation?