You need to add to the enemy the "platform" behavior. Disable the default controls so the player won't be able to control or interfere with the enemy movements, then at the event sheets add the condition on which the enemy will jump, on collision with something, when it sees the player, every x seconds, idk. And then just simulate enemy jumping. If this doesn't work try to check the conditions on which the enemy is jumping, or the jump strength or the gravity.