This is one of life's great mysteries.
Every stacked directory is the same, what I don't get is there's a limit so it's not a recursive directory loop.
It goes quite deep:
cd /usr/bin/X11/X11/X11/X11/X11/X11/X11/X11/X11/X11/X11/X11/X11/X11/X11/X11/X11/X11/X11/X11/X11/X11/X11/X11/X11/X11/X11/X11/X11/X11/X11/X11/X11/X11/X11/X11/X11/X11/X11/X11/
I still have my right click menu and have noticed nothing else that might appear suspicious. Should we try just deleting the chain of soft linked X11 files?
It's simply a folder that links back onto itself. I think there is a kernel limit eventually, but nothing seems unusual here, as my system has the same.
This should answer the question:
/usr/bin/X11/ is a symbolic link (symlink) pointing to /usr/bin/. Hence it contains itself and you can follow those X11 folders all day long but there's still just one on your disk.