For years, my desktop icons have acted as if they only have so many "slots" to fit into on the desktop. BUt this was never a problem. They were easier to line up because they were either right next to each other, or one "slot" above/below/apart.

Now, for some reason, I can move the desktop icons tiny distances, as if they are scalar items that can be minimally nudged. Suddenly there are no more "slots", and kind of paradoxically the icons are harder to group and line up because I have to keep nudging them so they look straight. Before, they were either straight or a whole notch out of line.