This happens, if you dock a window to the workspace borders. In this example lets assume that the workspaces are numbered like this:
1 2
3 4
Place a window to the bottom left corner on ws3. Switch to ws1. click on the window icon in the launcher. The window moves to the bottom right corner of ws2. Switch to ws1 and click again and the window moves somewhere betwene ws1 and 3
I made a video
http:// ubuntuone. com/5lAbHHkaNj2 UzD0b0022Pt
This happens, if you dock a window to the workspace borders. In this example lets assume that the workspaces are numbered like this:
1 2
3 4
Place a window to the bottom left corner on ws3. Switch to ws1. click on the window icon in the launcher. The window moves to the bottom right corner of ws2. Switch to ws1 and click again and the window moves somewhere betwene ws1 and 3
Can reproduce this on different devices