Not sure sustraley but it looks like you did the white border first and mitered it. Then you did the green, printed and then green again. If this is correct the white border is the one that is off and making your whole edges wavy. I can see on the white that the mitered is "pinched" so to speak, see how it doesn't lay flat? You have not measured that round correctly and it's puckering in the corners so your next rounds will all be off. If you didn't do that let me know what your "steps" were and I'll try to advise what I would do.