Ingrowns on one armpit only...?

I recently bought a gigi wax kit with stripless wax. It’s been great on all areas I have used it except my right armpit. I have several ingrowns there :confused: My left armpit is totally fine. I’m guessing it may be because I’m right handed so maybe I’m not pulling the wax off correctly with my left hand, but I think I am. Any other ideas? Or suggestions on how I can fix this?