If you hadn't told me I probably wouldn't have noticed, but it sounds like it bothers you or you wouldn't have asked. I love the quilt it is really beautiful. My husband would go crazy about!
I would leave it, but if it bothers you to much and isn't to much trouble to change, go for it. Personally I would declare it to be "my intentional error" if someone asks about it.
I didn't see it at first either, I am not a perfectionist, so I would just leave it, but I am will the rest, if it bothers YOU, redo it. It looks great as is.
Then since it's for someone else then I would fix it. But When I first looked at it it took me a while to see it, if it was for me I would leave it but since it not for you then.....