Questions about gameplay

Can someone explain to me how my players tend to spread out defensively no matter the player that I use or have used I believe most of the strategies. On defense Inside the Box my bot players will just kind of wander around and leave lots of open space. The answer I'm expecting is that happens to everybody but it certainly doesn't happen to my benefit against opponents. Is there something I'm not doing? Second question, why does it seem like most of the players I play against have players going on runs and as soon as I call an offside trap they turn around and get right back on side? My players tend to run right through the Trap and stay off side for 3 4 5 6 seconds.