QB contains messes up zones.

I don't know if this is intended or if I'm making a mistake, but most of the time when I call QB contain, all my zones flip, and sometimes they go back after you spam it, sometimes they don't. I don't think this is intentional, but it is pretty game-breaking considering most players scramble a lot and just run around the contains. Also, why do my players line up stacked on the sideline?