I am trying to push a wooden box into the kaboom to shoot it, I can get the kaboom boxed in, but then when I try to push the box to kill him I can't move

I have Wonderland, Return to Wonderland and Wonderland Secret World, and it happens in all of them, I think I must be hitting them wrongly in some way because Stinky just won't move

Hi New to Wonderlands but enjoying every minute, but I seem to have a problem - don't know if it is my computer or if I am doing something wrong. Each time I try to smash a Kaboom, Stinky won't move forward - it is as though my cursor keys are stuck. - Can anyone help