I recently realized that everywhere on stackexchange my Gravtar user image isn't showed, nowhere except Area 51.
I'm aware this question exists: Why isn't my Gravatar image updating? But I haven't changed neither my Gravatar picture nor my email for a long time.
The problem seems to be that a wrong hash is used in the request. The request (on any site except Area51) for my image looks like:
b6ff9d5130128e295b4cf69742c0458c isn't the hash of my email!
fcb8958be3b2d1c5049f96e900c29b14 would be the correct hash.
&f=1 is appended to my request, which forces the default randomly image.
In Area51 my Gravatar Image request is:
I'm 100% sure I'm using the same email address.
Does anybody knows the reason for this strange request for my Gravatar image?