This is just your friendly, semi-regular coffee quality focused PSA: have you cleaned your grinder lately?
A small brush (there was a tiny one included with my grinder when I bought it) is great for sweeping away the loose particles. If you want to get at the more “baked on” or more obstinate hangers on in the nooks and crannies, though, a toothbrush is where it’s at… unused in its explicit purpose, prior to use on your grinder, of course. Minty fresh morning coffee? Nnnnn-no. No thank you.