Ghosting effect

[Dmitrij]

I want to position three windows one below the other on the central monitor
I'm using the following rules:

(begin
(debug)
 (if
  (is (window_class) "Gnome-terminal")
  (begin
   (geometry "1080x500+1440+14")
  )
 )

 (if
  (is (window_class) "Gedit")
  (begin
   (geometry "1080x500+1440+640")
  )
 )

 (if
  (is (window_class) "Nautilus")
  (begin
   (geometry "1080x500+1440+1280")
  )
 )
)

When I apply these rules, most of desktop wallpaper space going black. Also, I observing ghosting effect while moving resized windows with mouse. See attached screenshots
What I expected to happen: I thought I would continue to see my wallpaper on all parts of the screen. Also I expected to be able to move windows with mouse like before
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Ubuntu 14.10, Devil's Pie 0.23, triple monitor setup