Duplicate icons in Applications Dock Stacks

A picture is worth a thousand words.

enter image description here

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

UPDATE: The official name for those shortcuts are "Stacks" (http://support.apple.com/en-il/HT201955)

Solution 1:

This issue may be related to the preference configuration file.

Delete the stack and re-recreate it, it should work.

Right click Applications in Dock, remove it from Dock and then add again. enter image description here