Altered Forum Behaviour in " View unread posts” in Yosemite

Is anyone else experiencing altered behaviour when viewing under the "View unread posts” tab after upgrading to Yosemite? After clicking this Tab I get a list of posts that I have not read as usual, then I click on one, read it and when done go back a page to the list. Previous to the upgrade the post that I had just read had disappeared from the list but after the upgrade that post is still shown. (Incidentally this behaviour has always beenn the case when viewing on my iPad & I have lived with it). Not a big problem but curious if anyne else has seen this. Cheers.