How does following users on Instagram work?

[Kevin]

I just recently accepted a user on Instagram to follow me, but I've encountered a problem--I couldn't see the user back. According to my user profile, there are 4 followers, but all I can see is 3; 1 user short. I've searched for the username but i couldn't find it. I don't know if I mistakenly "un-followed" him, after accepting his request that is why I coudn't see his profile nor his photos. On my news section, I can see and go to the user's profile, but i couldn't follow him. I find it odd though that it's stalker mode at its best. Can anyone shed some light on this?

[Kenny]

try clicking the notifications and the profile button back and fourth it usualy reloads