IPhone 4/Instagram problems

I just got my iphone 4 a week ago. It was fine for 4 days but now every time I get a notification for the app, one from 3 days ago reappears. I've cleared my notifications, so that's not the problem. It pops up like the user just liked my photo a second ago, but then it says 3days! It's the same username that pops up each time, and for the same picture as well. I got my iphone directly from verizon so it's not a faulty secondhand one.

Have you tried resetting the phone? Maybe even delete the app and reinstall it. I don't think I've ever had that problem before, but I guess if it keeps on contact apple or verizon customer service.

Last ditch effort would be restoring the phone to factory default, but it would delete everything.