instagram help?????????????????/?

[NeNe]

So I have 2,000+ followers on instagram and I follow 1500+. I follow people that don't follow me back and vice versa. However, when I try to search for a user, it won't suggest people it'll just say [search for ___"] and I have to type out the entire username, and if I don't know their name, I just won't be able to find them. I've uninstalled and reinstalled the app, but its the same problem. I have an iphone 4s running on ios7 also. But when I use my friends iphones, theirs searches normally.. Can someone tell me why my account does this or how to fix it please?