First of all i have 2 problems. The first one pisses me off the most.When i shoot at people it takes so long to kill them and my second problem is that i get disconnected without using hacks. Ca just shuts down.
Actually the first problem is a hitbox malfunction. The bullets dont register to the body of the character sometimes so thats why it seems they arent dieing especially when you shoot from the back try shooting them in the head or sides close up. Your second problem could do with lag. You should reinstall and play some games and it should stop. Thank me if i helped u and also nexon is working on the hitbox so it should be fixed when they do maitenance probably.