My self-judgement and assessment of these stickers tends to be about nit-picky things that fall outside the notice of most people. The problem with this sticker (which will definitely be reworked) is pretty obvious.
Inkscape has a pattern maker tool. It's really handy for a guy like me who really enjoys these things. However, I have learned today that it requires more precision than I usually work with. Those seams are a result of some weird measurements and snapping problems.
Back to the drawing board I guess.