Wrong number of receivers shown

The number of receivers shown in the "notification" activity/details page is wrong (it seems to be n^2 (16) instead of n (4)):

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Dashboard AppName
Notification Receivers Status Timestamp
{"ipAddress":”91.115.xxx.yyy","clientIdentifier":"Ae... 16 installations Succeeded 10 Nov, 18:01:44, 2014
Request IP: 91.115.xxx.yyy Full Request
Message:

{ "message" : "Test notification - please ignore!" }

Variants:
iOS Dev Succeeded 4 installations
iOS Dev Succeeded 4 installations
iOS Dev Succeeded 4 installations
iOS Dev Succeeded 4 installations

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When I look at the number of installations on the applications page, the correct number (4 in the example) is shown.

It seems the notification is only sent once per installation.