Thats funny that you say that, I thought the same thing because the ceiling tiles looked to be all shot up. I was told that this is from the security guard training that is given in the facility. They close down half the range and let them draw from holsters which results in a lot of shot up tiles!
Last month girlfriend & I went there to shoot and the security guard training was going on. Those guys were like the Keystone Cops - funny, in a scary sort of way.