I tried to clear the cache but nothing's happening, turning in my missing is a waste of time since whenever i turned in some things, after a days or weeks it's missings, it's just like all my hard work is wasted, sometimes when I turn in something after a few minutes the option 'turn in' was still there even though i already turned it in, sometimes when I turn in something I have to redo it again because of some kinds of bugs or whatever that stops you from turning in unless you redo it again