social security benefits worksheet question

When calculating line 3 on the Social Security Benefits Worksheet (2021) it asks you to add the following lines from form  1040: 1, 2a, 2b, 3b, 4b, 5b, 7, and 8.

 

Turbo Tax calculated to be $71,927, but I calculated it manually from the info on 1040 as $51,927, exactly $20,000 more.  Am I missing something?

 

Thanks.