definitely do like Prism99 says about the black border (and maybe that last one show in your picture--I'm thinking the blue/white/turquoise one is the problem) if you don't correct that, the last border will be wavy too--which could result in your long arm quilter either asking if you want to fix it first, or she could take a tuck in it--but it's so pretty I'd had to do that myself. I'm not seeing a wave or bag in the panel. I think panels can be tricky because they often aren't straight of grain when we cut them out.