Found a few things you should probablyyyyy fix.

Link to pics:
#1 https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=395967073
#2 https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=395967290
#3 https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=395967265
#4 https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=395967235
#5 https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=395967186
#6 https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=395967141
#7 https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=395967106

You're able to get out of the map fairly simple by jumping on your friend's head. If you're with 3 players you're able to get even further.

As seen on picture #2 you are able to camp ontop of the building where no-one can see you but you are able to see them and shoot them.

Thought I'd point it out for you :)