Without seeing your store the only thing I can think of is maybe you selected "instead of federal tax" when adding in your state tax, or is it not charging either?
If you go back to your tax area, is it showing it as 0% still?
Was this ever resolved? I've seeing the same issue- the admin shows CA state tax of 7.5% plus LA County tax of 1.5%...however when I checkout with Shopify and Ship to LA County (from LA County) I'm only charged the 7.5% and not the 9%
I have the same issue. My store is not charging ANY sales tax for California residents. The Taxes setup page is confusing so I've just tried unchecking the box for Sales tax is included in my prices. Any help with this would be greatly appreciated!