My 2nd Character Runs Around By Himself

Just started using ISBoxer today and I noticed when just sitting in town sometimes or when I'm playing I lose control of my 2nd character. I take my hands off my mouse and keyboard and he runs around aimlessly. Also noticed a delay so if I stack both characters on top of each other and I just run in a straight line 2nd char will quickly fall behind. Anyone help on this please thanks

Also when I swap from Window 1 to Window 2 to pick up a drop then switch back to Window 1 then one character stops moving