The last two times I've done legs curls at the gym my left glute will feel the burn on the third set, but the right glute did not even though I made sure that both legs were putting in the same amount of force.
After thinking about the last set I decided to do a fourth set with only the right leg doing the curl to get some burn.
So the obvious question as stated in the title. Is it normal for only half the pair to feel the burn?