For the $2,601 and $3,924 I see these entered as "accrued market discount", which isn't subject to the same treatment as direct treasury obligations, which is why it isn't being excluded on the state return. Only the interest paid directly from government obligations is considered to be exempt from state taxes (as it is not part of the actual coupon payment).
I tried to find a nice source to link for you here on that topic (which is often somewhat debated in internet chats) but there weren't any that I could easily share here specific to California's treatment of accrued market discount. California addresses it, though, in code Title 18, section 24271(e) if you want to do some digging on your own.
It is also addressed in federal code HERE. Of course, the federal code doesn't speak to California/state rules but it does tell us that it's treated as "ordinary income", and not as interest income. This affects how most states tax government interest. The exception to taxing government interest is very limited. It applies to the interest paid directly by the government (whether this is the US not taxing state interest or the state not taxing US interest).
I hope that helps explain it so that you are now confident to file your return. However, if you have additional questions it's no bother at all for us to answer them - and I will try to keep an eye on this thread just in case!
Thank you, also, for the feedback on functions that would make completing your tax return easier for you.
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