Social Security Benefits Worksheet and Schedule 1 (Form 1040)

I have completed filling out my 2020 Tax Return using TurboTax Deluxe on Windows.  Upon reviewing the Social Security Benefits Worksheet, Line 6 shows $300.  The instructions for Line 6 on that form states that the amount comes from Schedule 1, Lines 10 through 19 and Line 22.  When I check my Schedule 1 form, Lines 10 through 19 and Line 22 are all blank.  My question is: Where did the $300 amount on the SS Benefits Worksheet come from?