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(+1)

that's odd, which tool are you using to make them? could be a bug because I used tiled to make the previews and didn't have this problem. I already checked the file and everything is ok, by the looks of it, it seems that the software you're using got the grid off by one pixel.

I’m using construct 2, turns out, it’s just a bug in the editor, but when I play it it looks fine. I think it’s a glitch on construct.