i don't personally experience this, but i've heard of it. if it doesn't bother you, let it be. otherwise try and nurse first with non-dominant first twice, then dominant first, then non twice, etc.
It's definitely possible for that to happen. When I was nursing DS, my left side produced far more than my right. Now that I'm nursing DD, I don't actually notice a difference and don't see much of a difference in output when I'm pumping both either. I figured the left would remain my super-boob forever since it was that way with DS, but it turned out not to be the case.