I recently installed a new Kholer toilet. I first placed it on the outlet hole to make sure it was a good fit. But when I put the wax ring on it now doesn't set flat on the floor and I have a rocking tiolet. I think the old tiolet had only a wax ring. But I put a wax ring with a plastic collar on the new tiolet. Is this my problem changing out the wax ring with one with no collar.