It will not "magically" get better when it is off the frame. If you can live with it as is, leave it. I am assuming you would have seen a problem before advancing the quilt if it was noticable on the front so I am assuming it is not visible on the front. It may become less noticable after washing.
BUT, if it will bother you, now and forever, rip it. If you plan on showing this quilt, rip it. If you plan on gifting the quilt, rip it.
It looks like your backing got a little loose in the frame. That is what caused this.
Beautiful top BTW