So, I'm making a map. In this specific map, it started after working on it for a while (shortish time) to stop using the units and I can only drag things smoothly. I opened a new file to test the problem and it worked fine. So, does anyone know what to do with this issue?

Did you turn Snap on, off?

Yes. (Snap object to grid?).

Shift + W to toggle snap to grid.
[ and ] to make your grid smaller or bigger

Thanks, it works.