I'm not sure that I would leave it. It does look just fine, but my OCD would kick in and I think it would bother me. How much OCD do you have? If the answer is not much, then leave it. You did buy both sides of the fabric after all. You could use a couple more of the upside down colors and convince yourself that you meant to do that. I don't think it would bother me as much if there were several pieces that way.
Sue