watch this. Its weird.
When this happened to us we found it was locked in one of the rooms we hadn't opened the door to yet. Took us a while to find it but we did. Nice break time to run around and do whatever you need to do before you open the door and kill it.
very strange! happened to me but like someone has stated above I found the last one on the floor below the roof and stuck in the UNOPENED room opposite the MP5K
think they just get stuck cause of the way they teleport :/ just gotta go hunting for it haha !
Lol this happens to me and my friends all the time, it's either across from the mp5 stuck where the isolated elevator room is, or in the caged area in the middle.
But this glitch/error is nothing compared to the one we've been experiencing.. We had a zombie appear to be riding an elevator through the entire building, floor to floor. It would just float from one floor to the other, following the movements of one of the elevators, swinging it's arms like it was attempting to hit someone while stuck in place.