This is my area 51 proposal ad.
It shows 3 followers, but there are 5 followers.
What is the reason for the inconsistency?
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All images served from Stack Exchange are very heavily cached so they don't have to be downloaded so often. That also includes flair images, which probably change more often than these Area 51 advertisements. Give it some time, your browser will eventually download a newer one (or you can clear your local cache to force an update if you want).