For my 2022 return I had a similar problem. On my California Adjustments - Residents worksheet, Part II, line 5a, where was it getting the value and is the value correct? I tired everything and just couldn't get my numbers to add up to the value shown on 5a. After a very long search I stumbled upon what appears to be a hidden form that clearly showed how turbotax got the number (what they added and subtracted). Here is how to find that form that I think is hidden. (turbo tax should identified values that link).
Go to your Federal Forms and open the form "Tax & Int Wks".
Double click on the number in the column on line h. (Most turbotax numbers aren't linked but this one is.)
This brings up the (hidden?) form "Schedule A Line 5" titled "State and Local Tax Deduction Worksheet"
This worksheet shows the detail of what is included in line 5a of the California form. At this level I was able see the appropriate detail and see that line 21 is subtracted, and have confidence in the result.
Hope this helps.
