Artillery dont attack

I usually play with artillery but when the opponent is too far, the unit just get stuck in the middle, dont move and wont get closer to the enemy, wich means artillery as mangonels and nest of bees just dont make their job, i just got mad because i played 2 games today and in both the artillery just got stuck and i just loose all the other units because of this TERRIBLE bug, this have to be improved ASAP.