Orthodontic treatment is started in order to move the teeth into a better position or to correct a misaligned bite. Moving the teeth changes the way they meet. While the teeth are settling into place, you may feel different contacts, with different pressure, on the left and right. If you have a lot of discomfort, you should of course tell your orthodontist. Although these complaints are to be expected, we can relieve them by selectively and temporarily building up certain teeth to improve the contacts during treatment.
This answer is for general information. Your own case needs an examination by an orthodontist.