For some reason, my gravatar identicon is not consistent between sites.
On most Stackexchange sites, my avatar is what is seen below. For clarity, this image.
But on the Politics beta, it has changed itself to a different one, without anything being changed. No changes to avatar settings, no change to email address, nothing. And it appears to be only that site, none of the others show this changed avatar. I'm not sure when exactly this happened, as I'm not that active on Politics and don't generally look at my own avatar much in general.