In FORMS mode, when you're viewing the worksheet with the red entry, click on ERRORS at the top left, next to 'Open Form'.
Then look at the bottom of the form where TurboTax will tell you what the Error is.
Or, hover your cursor over the amount and if you get a Magnifying Glass, this will take you to the source of the entry.
Otherwise, you may want to Delete this form, and step through the Social Security interview section again to see if it repopulates the worksheet correctly.
@Bruce202