because if it wasn’t in your crude, then it’s almost certainly not CBC
I gave you a link to follow…here it is again.
current best guess is that it is a delta9 degradation/isomerization product. possibly delta10 or 10a THC.
maybe check out this thread as well: Where oh where has my potency gone?
Edit: not saying the lab is bullshit, just that you should find one that is more knowledgeable about distillate. They should have noticed that the retention time was not quite right, and admitted they didn’t actually know wtf it was.