[Sjn]

That's because, ~n~ creates a new line for your text and the background (box) also gets extended when you use it. And it's a known bug for the font type 3 in textdraws/gametext. Either change the font to type 1 or 2 or create another background (box) separating it from the actual texts.

A small tip: You don't need format to set a textdraw string that does not contain any parameters.