Ok there is some decidedly odd stuff going on with the site.
1st I noticed the size format of the display is suddenly presenting much larger.
So I put up a thread asking about it and the noticed that when I come across one of my own posts, it displays a giant gender symbol and a giant birthday cake symbol within my post.
(Probably only I see it)
Next thing is the whole thread disappears without trace
it's happening on my Macbook Pro and ipad both running up to date OS and using Fire fox browser.
I fired up an old Windows POS also running fire fox and it's not doing it on that
Below are some screenshots to show what I'm talking about: