Retirement tax questions

BTW, I printed out the Lump-Sum Social Security Worksheet referenced in Line 19 and filled it out manually.  If I did it correctly that number was $11,000 and Line 20 should have reflected that.  One problem is I had no lump-sum payments so I used 0 for Line B.  Consequently, I don't know if Line 19 should be 11,000 or 0.  In either case it is less than what is printed in Line 20.