Why is Turbo Tax deducting one of my pension amounts from the taxable amount on line 5b 1040-SR? Three pensions have all been fully taxable in the past.

Try deleting that 1099R and re enter it.  That may clear something out.  You might have answered a question wrong.  What code is in box 7 on it?  

The code in box 7 is 7, as it has always been.  I deleted the 1099 and reentered it as you suggested.  That seems to have worked.  Thank you!