I setup a just account for my kids so I can restrict access games they shouldn't be playing etc. The notifications from my main account are populating their notification area. For example, I use Astrid for tasks and Tapatalk HD for the forums both apps notify my kids. I did the notice this behavior on stock 4.2.1. It could be a 4.2.2, a PA thing, or something related to those two apps specifically. I have no idea currently.
Sent from my Nexus 7 using Tapatalk HD