PvZ Garden Warfare: Problems with 2 monitor

I have 2 monitors but I only play on one. As I play it seems like every few battles my mouse trails off to my 2nd monitor, causing my full screen game glitch and go half screen in which time I end up dying. This is very frustrating. Most games I play "lock" me into the game window yet with PvZ my mouse flides off the screen.

I cannot play in windows mode because, for whatever reason, my game is laggy to the point it is not playable.

Thanks for the help.