Rainbow wisp looks funky

[rutgerberit]

Android 4.1.2
Game version 1.5.6.3

I thought I'd redesign my shop and found this nice wallpaper, Rainbow wisp. But when I put it up, I noticed it looks kind of off, like it doesn't fill the tile entirely and there's a multicoloured gap in between wallpapers, when placed next to each other. It doesn't seem to happen when placed next to other wallpapers, only when multiple Rainbow wisp wallpapers are placed next to each other.

(In another note, it would be nice with a matching jet black wallpaper...)