@Daboa Same situation as you, higher refund amount on the 2023 return vs. a lower 1099-G amount. The difference was exactly equal to the amount on line 34 of the 2023 state return, "State Sales Tax Refund". It is related to TABOR.
References:
https://tax.colorado.gov/sites/tax/files/documents/ITT_State_Sales_Tax_Refund_Jan_2025.pdf
https://coloradonewsline.com/briefs/colorado-irs-tax-tabor-refunds/
Also, thanks for posting your question, just started my return and it was a little discouraging to face an issue so soon. Your posts and @VolvoGirl's post saved me a lot of time chasing down the answer 🙂
