monitor always opens in the middle of monitors

Need more info, start at the beginning not the end. What do you mean in the middle of the monitors? You have multiple monitors and any program is split between them instead of on one side or the other? What happens when you move the program to one screen and maximize it, then close it, does it revert to being in the middle again?

Do you have any screen management programs like MultiMon installed? Try updating the video drivers?