It looks great as is. If you're an "A" personality, though, it will drive you crazy until you fix it. However, if you plan to give it away or sell it, in other words, let it go, then "let it go". I read an article in a magazine several years ago that said it was a common practice in our history to purposely put an error in the quilt to illustrate that none of us are perfect. Use your own judgement.