i would leave it alone. Because of it's location in the center, and your use of solid blocks, it looks like a deliberate choice of colors/fabrics. I would not have looked at it said "Mistake". I would have thought it was a deliberate and well thought out fabric placement decision. Your decision is what will make you happy. If it will bug you, re-do it. Sometimes those unplanned things in a quilt end up being the best element. Nice choice of colors!