User blog comment:Bluemask/Why does my avatar keep reverting.../@comment-53539-20140309163100

Okay I don't know if you've resolved this issue but I'll reply just in case you haven't.

Its likely not your cache system but the wikis. It happens across all the wikias. The most infamous is images, for years people had trouble when updating them to get the RIGHT image to show, as it kept showing the original image that was first uploaded. This often lead to many doing additional uploads to get it to work.

I'd get hold of the wiki staff and try and ask them. Your likely not the only one.