Larian Studios Forums Divinity - Original Sin Divinity - Original Sin - General Is Displayed "To Hit" % Correct? (missing a lot)

I don't think the moving hitbox affects it. Could be wrong, but I believe if you're targeting them when you click, it should hit.

Elevation and corners definitely cause problems with it, as you'll see when enemy archers shoot a hillside or a wall because they don't realise that the arrow won't reach you.