I just installed the game and when I start it up it displays on my main monitor correctly but before it gets to the main menu it moves the game over to my other monitor. Now if I turn off fullscreen it always displays on my mains creen properly but as soon as I turn full screen back on it goes back to moving the game over to the other monitor before hitting the main menu.

My system specs:

AMD FX-9590 | 16GB DDR3-2133 | MSI RX 580 8GB Gaming X | Mesa 17.2.5 | Samsung 850 Evo 250GB | Solus Mate 64 | Kernel 4.13.15 -34