ze Jurassic park EXPLOIT

So in one of the zombie escape maps which is Jurassic park.One of the parts for defending,you can jump over the box and get a head start.The only way to get up is if you have the jump high class for both humans or zombie.So since some people in the server already know how to do it they are jumping over the box and get a head start which you are suppose to defend at the box for 30sec to get on the truck or jump over the fence.Thus making it hard for the zombies to catch up since they are blocked for an additional 30sec while the humans get a head start and have the zombies to run through the obstacles