Mac client reorders multi-monitor setups on first launch

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I use an external display as my primary monitor for my 2011 Macbook Pro. The Macbook sits next to it as a secondary extended display. Whenever I start up a game of League my monitors will flip orientation, but the external monitor retains control of the game despite not being set to primary.

For example, my standard setup is this:

[ 22" Monitor ] [Macbook]

When the game launches the OS suddenly reorders to this:

[Macbook] [ 22" Monitor ]
such that scrolling to the left of my primary display causes the cursor to appear on the right side of my secondary display.

This only occurs after launching a game for the first time after opening the client. If I open system settings and reorder the displays back to normal, successive game launches will not continue to mess with the displays.

Mac OS X Version 10.7.5 (Lion)
2.5 GHz Intel Core i7
8GB 1333 MHz DDR3
AMD Radeon HD 6770M 1024 MB
Late 2011 model 15-inch MBP