IPhone Facebook notifications?

So yesterday my girlfriend logged out of my Facebook on my iPhone and logged into hers. She logged out and I logged back in. I keep getting her notifications sent to my phone, but they don't show up in the Facebook app. It's just like a text message on the iPhone. I tried logging out and in again and even deleted the app to redownload it. How do I get her notifications to stop being sent to me? I'm not even logged into her account anymore.

As far as I can tell, the problem is that it's an iPhone. To fix this problem I suggest you switch to a galaxy note 2, or perhaps an Nexus 4.