When I move icons (shortcuts) between desktops sometimes some of them dissappear.

I have narrowed it down to shortcuts starting with the same letter-sequence, for example:
Warcraft III.lnk
Wacraft III - A frozen Throne.lnk

When I move these on the same desktop one of them dissappears.

But the icon is still there, because when I want to place it from the start menu onto the desktop it says: Already exist ...

And I see the Icon in the Hidden Icons in the Desktop windows screen.

So it looks like a bug in the display icons routine where spaces are not taking into account or so.

I have woked around it by placing a letter "a" in front one of the two shortcuts.