Me and my friend died into this problem, we found out that when you remove the barbed wire equipped onto the wall it instakills you when you are close onto the wire, My character died instantly by just removing it, instead my friend when he opened the gate he got killed Instantly when the gate opened in his face.

We had to remove the wires because of that bug problem.

Careful everyone when you use the barbed wires, they turn gates into Killing Machines