They are not measuring for D8THC and are most likely confusing CBC for D10a THC which is an isomer of D9THC (see THC Impostors) . I am surprised that they test for 9 cannabinoids and are not measuring for D8 THC as it is very easy and important to separate D8/D9 THC. Ask them for a chromatogram then we can get a good idea of the other components.
For regulatory labs in Southern California I recommend Infinite Chemical Analysis. They have some of the fastest turnaround time (48 hours or less for all tests) and very fair pricing. They are very experienced, qualified, and easy to work with.
I have also heard good things about Cannalysis but have not personally tried their service.