I’m going to directly copy what I said on the irc about this bug. I find it very confusing, and don’t quite know how to reproduce it.
So, here is a video of the thing that happens: https://imgur.com/a/r6Cb3oE Basically, -sometimes- and I can’t figure out what triggers that, but it has something to do with switching between files, the brush circle starts snapping to some sort of grid. The grid is NOT single-pixel-sized, and it’s NOT the same size as the one shown by “show grid” setting
the actual lines being drawn are not affected at all, ONLY the visual indicator of where I’m supposed to be drawing
Whoever the bug happens, I can turn the snapping off my changing the zoom level, and then turn it back on by switching to to a different file and then coming back.