Inconsistent grouping
So I got my first compound bow this year, and have been practicing with it a lot lately. I have been noticing that my groups are not consistent at all. I went to an archery shop, and they said I had good form. But I will shoot one arrow high, then one to the right, then two too low, ext, ext. I think one problem might be that I have a terrible anchor point. I usually just put the knuckle of my trigger finger on my earlobe. If you guys have any tips that could help, I would greatly appreciate it.
By the way I shoot a Mathews mission craze at 26 inch draw and 40# draw.... if it matters.