Horrible distorted sound when adding additional track

So I just got a Focusrite 2i2 and set it up with Cubase 5(yes, an old one). I’m also running BIAS FX for the guitar, and everything is fine until I add a second track. With just one track, the sound comes out fine, but once the second track is added and BIAS FX assigned to the insert, the sound has horrible distortion bordering on white noise. I set it up the same way as my friend, who has no problem at all(different AI though). Any advice would be greatly appreciated.