Duplicate icons in Applications Dock

A picture is worth a thousand words.

I have a shortcut (not sure what the official word for this is) to my Applications folder in my Dock.

When opening it, I see multiple copies of the icon "Xcode.app".

If I "open in finder", I only see one. If I open the launchpad I also only see one.

Don't mind the folder called "Xcode 5", I added this only yesterday while this multi-icon bug has been there for over a month....

Running OSX 10.10.1