Yeah same, I was looking to see if there was a mangadex customer support page or something to report a bug. I went to my follows and the page went black (was super confused) then I looked and none of the manga were stories I read and in the top left corner it was someone named "Retorim" or something starting with an r and had an m in it. They had it on black mode, not light mode. I went to my profile and it all went back to normal.