Unity Launcher: Last Pinned Icon Changes Its Place

[j-stuffer]

When you start an application that isn't pinned to the starter, the icon of this new application sometimes (often?) is put before the last application-icon on your launcher.
This happens on my desktop, aswell as on my laptop and also on the desktop of my mother.

Here two screenshots to illustrate the problem:
1.) Launcher before
http://ubuntuone.com/79Ol6LnQawhHJsy2JBiLqM

2.) Launcher after new (not pinned) window is opened
http://ubuntuone.com/68d0GTIyoslOL7Z7Y9se3t

- This also happens when another program than vlc is at the last place
- This happened to me with a lot of different (not pinned) applications coming to the launcher
- The number of icons in the launcher seems to have no influence

[j-stuffer (j-stuffer)]

Here a screenshot from my laptop:

1. Launcher before:
http://ubuntuone.com/55WM9W9Ys18Wv8rn1LntlP

2. Launcher after (not pinned) window is opened
http://ubuntuone.com/5orfXO7LOtKLdAg7lxrvcB

Furthermore it seems that after the start of the system this bug occurs more often, but after some time (perhaps when some applications were already started and closed again?) the last icon stays on the right place.

[j-stuffer (j-stuffer)]

Also happens with the Live CD:
http://ubuntuone.com/61nje2iRbZb7tvfS9C0zHG