Problems with playing at a System with second Screen?

Hello Party People

Im playing on a System with a second Screen.

So far when i start the game up wiht the second Screen unplugged i have on the right screen Claptrap dancing around until the loading ends and then i have on the left screen the game itself

in prinicpal i wouldnt mind a stuck claptrap but the problem is that my mouse coursor is going with claptrap but the game is on the second monitor …

the Monitor is conected via HDMI

anyone any ideas why this is happening? works with a number of other games like a charm

thx and cheers