Why is my CO state return 21,000 I doubled and tripled checked everything ?

[SteamTrain]

"Refund" is $21,000?

Still, likely a mi-sentry on a w-2 or some 1099-type in its state area.

More than one person ahs accidentally entered their state "wages" in the state withholding box.

Others have accidentally entered a comma instead of a decimal point, which can transform itself into a huge number.

Delete each income form one at a time and re-enter it manually.  NEVER upload a picture of an income form...that has resulted in some pretty massive errors by the supposedly smart AI.