In build mode (or whatever it’s called when you’re placing buildings), buildings seem to render 1 px above where they are supposed to be, and animations seem to render 0.5 px above where they are supposed to be. Or, at the very least, there is a strange half-pixel offset between the base frame and the animation. The weirdness disappears when the building is placed.
The video shows an example where the clockface is the animation and the rest is a normal frame. You can see the clockface is not aligned to the same grid as the building. The bug is found on other buildings as well, but this is the clearest example I could get.
I am on the latest iOS release (1.12.43i) so idk if this exists or has been fixed on other platforms.