Thanks for reporting, the player has already been banned 

Hello there,
I think the problem is because you are doing /kick /ban /mute.
When you're on your playerserver you need to do /ekick /eban /emute, due to /mute /ban /kick is for cubedcraft staff.  
I am pretty sure this is the problem here. if this doesn't work contact me and I'll gladly help you

~GellyZ

I really don't think its necessary to get this plugin, but this is my opinion. If people do things that isn't good on the PS the staff could jail/mute or kick/ban them.

~GellyZ

This is an good idea, but they could make so you don’t exit out of the menu, but there is an back button so it’s not as slow. But I agree this should be fixed/added

~GellyZ

Got any proof?
and was this on a ps or not?

~NeedMuch