The problem appeared when my friend followed me, notification came and I clicked on my profile to see my followers. My friend appeared in followers list, but number of followers didn’t change. It was changed when I clicked on profile after 2-3 minutes. If it is so conceived then sorry for troubling. Otherwise - was glad to help you in finding bugs =).
Link to the image: http://clip2net.com/s/3oAT8lf