Does a post actually disappear when you click its "hide post" icon?
At first. But after you refresh or switch from hot,pop, and etc it reappears
Are you sure it isn't a duplicate? Many users have been reposting each-other, daily.
Try to hide a post and check your hidden posts page (sidebar in your profile) to see if it is actually hidden (showing up there).
I wonder if a new reply per post unhides by default?
It does then comes back after.
You said it works in private mode, so there's something going on with your browser.
I can't reproduce your issue here at all, no matter the browser.
Will try at home
(post is archived)