CA Tax-Exempt Interest Not Working Correctly in TurboTax Premier?

On the Federal section, I have specified California as the state for Tax-Exempt Interest (from Vanguard Consolidated1099) - it's 100% CA since it's from CA Municipal Money Market Fund.

 

On the CA state section, I have also specified "No, All Funds are 50% or More invested in California or US Obligations". I noticed that the checked box does not stick... it always remains blank even after I check it and go back to look.

 

However, the Schedule CA does not seem to exclude the CA tax-exempt amount because it uses the amounts from 1099-DIV Box 1a; if I understand correctly, this is the total amount that includes Box 12 - Exempt-Interest Dividends.

 

Is there a bug here, or, am I mistaken in my understanding about Box 1a including Box 12 amount?

 

Thanks for any help in advance!