Recently, I noticed that when I temporarily went onto my meta profile, my nice purple avatar changed into a lime green avatar. You can believe that I did not change it. I can give time stamps if needed for when the photos were changed:
When making this question it turned back into my normal avatar:
I suspect it is the same reason why community’s did the same. My post at one point had -4 to 4 although there is already another good meta post on the phenomenon linked to the italicized link. I also remember when I joined MSE and got my own colored QR code looking gravatar. Maybe there is something the same about the lime green and purple avatar, like my used number used as the avatar generation seed, that made it change? I hope you agree. Please correct me and give me feedback!