I was just browsing CGCC, and I went over to the meta, and noticed something strange: That's not the indenticon I've come to recognize. Somehow, my identicon changed sometime in the last day or two, and only on Meta. Across the entire network, my identicon on meta sites is different from my identicon on main sites.
There was recently a bug with community's profile picture, but this is a different bug. As pointed out by caird coinheringaahing, this seems to be a new bug that just happened and is affecting any users, not just older users. Also, this is entirely to do with the identicon, not a gravatar profile picture, as in the other related bugs that ollie mentioned.
Why did this happen, and more importantly, is this supposed to happen?