What you gotta do man is never restart the map when you get into it. Always just quit out of the game and start from the main menu (of the mod, you don't need to reload the mod itself everytime you restart), yeah dude the same shit happened to me for so long before I painfully went through the comments trying to find the answer.

 Thanks friend, but i already descovered it, thanks for trying to help bud.

So, i installed the map right now, and i enjoyed it too much, but, i can't buy any wall weapons, when i try, i only lose money, and everytime the zombies hit me, the game stops for a few seconds, you have a solution about this 2 bugs? i know that have 3 months since the last time anybody commented in this topic, but i have hopes. Bom trabalho com o mapa. (Translation: Good job with the map.)