Its not a duplicate it has nothing to do with a corrupted sound file(You flagged it before you even tested it ingame why)
I dont know its server sided
This isn't a bug, /difficulty is a command that only works when cheats are turned on, it is supposed to override locked difficulty so that you can change it on servers where its always locked
Its not a duplicate it has nothing to do with a corrupted sound file
(You flagged it before you even tested it ingame why)