No value appears in 1040 line 4a

Within TT, I see the IRA RMD values on the wages and income page. I've completed  my return and had TT check for errors - all is OK. But when I print out my return to check it that way, lines 4a and 5a are blank. 4b and 5b have values which are correct.

 

Why no values in 4a and 5a?