Wingbacks are scared of crosses?

I have a Match Engine/ Tactics question. I currently play a 4-2-2-2 formation with 2 wingbacks which are told to stay wide, run wide, Cross early and dribble less. But all they are doing in the match is run deep and dribble into the box and do everything instead of crossing :D The funny thing is when i quick sim the game and watch the replays afterwards i can see that they are throwing one cross after another in the box :D What do i have to tell them to cross the ball :D pls help me