key getting stuck

I have setup alt f and alt s to be strafe right/left respectively for my slaves. I'm trying to do the stupid Ick encounter. f and s are strafe right/left for my main with the alt. when i strafe with the slaves, sometimes (it seems to be happening more frequently) it makes my main strafe too. and not only that but he is stuck strafing and won't stop until I make him strafe (ie press f or s without the alt). it's a bit frustrating.

any idea what is causing this?

well it went away on its own. And I got ick down. And i was too burned out to continue heh.