Hi I was testing the page and it's great, just one thing many times instagram appears as busy but in reality it is not, I don't know if it is a bug or something with isntagran in particular. Thank you so much.
When you pass a username longer than the limit allowed by a service, it should show that it's not available for that reason. For instance Twitter has a 15 character username limit but will show any username longer than this as available.