Nupe, you could be right, but have you tried other magazines yet? Only on the right side of the magazine seems to be a clue. Of course try some other ammo, but I would try another mag 1st. Insufficient gas pressure could cause the bolt to not go back far enough to strip the next round and that could be ammo or gas system, but that would not be my 1st thought. Start with the easy button.
Keep us informed.