Plutonium

I have the same problem in zombies but also in custom games, it's very annoying I can't jump or my character is slowed down after a jump... I saw in the command section that there is command which says : "jump_slowdownEnable" I can't fix it, even when I go into the files and I delete this section.
I already tried to uninstall the game and download it but it changed nothing, can someone help me ?