I think it looks fine. I'm sure I wouldn't notice it if you hadn't pointed it out.
I'm guessing you're talking about the wavy connection between the outer 2 borders. If so, in the future, seam together all of your borders first, then sew them onto the center as a unit & miter the corners.
If you're instead talking about matching up the repeat, that depends on the fabric itself. If the quilt is finishing as a square, it's quite easy. You just find the center of the quilt & lay the borders so that the center of a motif on the border lines up with the center of the quilt; pin & sew. I'd figure on having some waste fabric on that & would seam together my borders first -- taking care to line up the center motif on each one -- so that way the borders would lie nice & flat.
For a rectangle shaped quilt, you really need to have both the length & the width of the quilt divisible by the length of the repeat (that is, the repeat should end at exactly the same place whether you are laying it on the long or short side of your quilt). In that case, I would sew each border on individually. As this point, even if that was possible originally, I don't think it would be worth it to re-do the borders.
There are a couple of classes you might find helpful that have sections about mitering borders:
Jinny Beyer's free Craftsy Class (note: this is a 90x90" square quilt):
http://www.craftsy.com/class/2015-cr...khiu&_ctp=4816
Bonnie Browning's iQuilt Class:
https://www.iquilt.com/course/border...shing-touches/