Seems well built but did not hold hold scope in place - Burris AR-P.E.P.R Rifle Scope Mount

Burris AR P.E.P.R. Review - Ive mounted over a hundred scopes in my life and ive never had one move one me. This one allowed my scope to move on two seperate occasions, which is why I returned it. First time to the range the scope rotated - maybe i made an error? - reset and remounted the scope and took to the range again and this time the scope slid forwards. I know i used proper torque, loctite, leveling kit and the ring/tube measurment was correct, and it still moved twice. Ive used this mount in the past with no issues - maybe i just got a lemon. Ive since gone with a Vortex mount on this particular rifle and its solid