how to stop apps from downloading twice

[Android Question]

The apps I download from Google Play downloads again as soon as I disconnect from Wifi. This is annoying as I have a data limit.
The apps don't install again, I just get bunch of 'application already exists' notifications. Under Google Play store settings I have 'Auto update apps over Wi-fi only' selected, so I'm not sure how else I can prevent this.
(I have Nexus 4 with Jelly Bean).

 

[Hadron]

I've never heard of that one before. The only thing that comes to mind is to try turning auto update off completely and just update apps manually (this is what I do anyway, because I prefer to check what an update changes before installing it).