I think it has something to do with the GUI. Most hacked clients have some form of a "splash" that pops up when you join a world that allows you to select your modules. Maybe some settings related to the GUI are broken, try poking around and see.
There are also a lot of errors being thrown about saying that "forgexxx.class missing". Maybe install forge and see what happens.
PepijnSolution: Don't install/use hacked clients.
He asked for help, not a life lesson.
Plus, not everybody who uses a hacked client is trying to ruin someones day in a match of Skywars or the likes. Some, like me, even just use them to mess around in survival.
