Shift drag

[Flaffy]

So I accidentally shift dragged one of my walls, and now its moving smoothly, not as it was before where it would line up with the grid.
Please help! How do I fix this?

 

[Fruity Snacks]

You probably disabled snap to grid.

hit Shift + W again things will snap back

 

[MoonFox]

shift+W unlocks the planar movement of brushes, Shift+drag is the duplication tool