Since a week I see pins where I explicitly unfollowed boards. I cannot hide them any more they just show up all the time.
Also the home feed is not a chronological any more. Every time I refresh the browser I see new pins! And a lot are old and repeat themselves! When I see a pin that I like, but not want to directly pin it on my boards, I will never find it again now. If I wanted to see only random pins, I would use the search function and the pre "prepared" topics like "Architecure" "Popular" etc.
That all is so annoying that I now already start to stop using pinterest :( :(
I contacted the help center, but no reply at all. This was also different a year ago.