It's not really a big deal, since it can be fixed just by adding or subtracting a few pixels from the height such that the height is divisible by 4 (I think that seems to be the pattern, at least), but updrafts do not tile correctly in the y direction when their height is not a multiple of 4. It looks correct at all sizes in the x direction.
It also looks correct to me in the editor, but of course it's not animated in the editor.