Why does turbotax keep asking to revisit the capital loss carryover amount? it says it is zero but I did not use up all of the loss last year

On the income page The 2019 column shows the carryover to 2020 (not your current loss for 2019).  Schedule D doesn't actually show the carryover amount. To find your  Capital Loss Carryover amount  you need to look at your  return schedule D page 2.  Line 16 will be your total loss and line 21 should be a max loss of 3,000.  The difference between line 16 and 21 is the carryover loss for next year.