Comment 4 for bug 728428

once it started, I can also easily confuse the workspace switcher: when I drag a window from a workspace in the switcher, I see another window move in another workspace instead, from about the same offset (like 2 workspaces on the right if the workspaces have been rotated twice in the same direction).

I can confirm on my other desktop, configured the same way.

it seems it's compiz related, more than unity.