Razer Deathadder V2 problems

Hey guys :) I just bought a new Deathadder, since my old one died after 8 years :( Sadly the Deathadder v2 doesn't work properly and I really dont know how to fix it. So, the problem is, that when I use the mouse to move horizontally, it moves vertically a bit. This doesn't happen to any other mouse, I already tested it. Is there something I have to set up, or is it just a defect one? Kind regards!