What is wrong with my Instagram?

So, my sister and I both have an Instagram, She recently got an iPhone 4 in August 2012. She downloaded the Instagram app and logged into her account. A couple days later I logged into my IG account on her phone. From then on she keeps getting my notifications and hers. I got an iPhone 5 in December and logged into my IG account hoping this problem would disappear. It still hasn't. She gets notifications when my Facebook friends create instagrams and she gets notifications that they follow her. I think it's weird how all of my Facebook friends are following her Instagram and not mine. Is this a problem with Instagram or Facebook, cuz I also logged into my Facebook on her phone around the same time. Is there anything I can do to fix this? This problem has been going on way to long!

Perhaps your friends just don't like you as much as they like your sister, perhpas you should ask them.

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