mouse bugging like hell

[Daft Unikorn]

In game I get two mouse cursors for some reason and my mouse isn't registering where it is visiblly, my mouse works fine in literally everything as it's supposed to but this game, if I want to click the middle of the screen I have to move my mouse all the way to the top left corner for it to register, even logging in, I have to guess where the actual invisible cursor is just to click on buttons