Ok so today i went to the nearby EB GAMES and bought a cheapy USB PC controller (Same as XBOX one without brand and icon in middle) and challenged my brother to campaign. the first site we both attacked against each seemed all good.... then i went to fire with right trigger and it exited the battle????

so, I went into the Options and controls and changed multiple different configs all of which seemed to glitch out and make my aiming fail to work.

for Example: trying to avoid the Right Trigger i used all other controls the same as Recommended except for:
Fire/Activate:Right Bumper
Command Menu:Left Bumper
Next Unit: B
Prev Unit: X
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so i go into campaign and try it out RB and LB work B and X work but then aiming left goes PREV unit and right NEXT unit?? why does this happen???

please can somebody help me ASAP so i can kick my brothers Ass in Campaign(Confidence Much)