Sounds like your 1040SR line 26 is wrong. You have an amount listed but the IRS didn't get an estimated payment from you. Check lines 25 & 26. Do you agree with all the withholding and estimates paid? Did you send in all the payments shown? Did you file an extension in April but not send in the payment?
Sometimes people enter their W2 withholding in the wrong place and it shows up as an Estimated payment on line 26.
