I've mentioned this before, but my Chatter history is weird. I can see the comments chronologically going back about a day... and then it jumps to one specific post from a long time ago. That one post (the one from kleinbl00 on Medicaid) is always the next post after one day of Chatter.
I can't see posts from 2 days ago... or a week ago... or whatever.
Here is an assembled image showing the progression of three sequential messages in my Chatter feed:
My chatter went weird yesterday also. There were a bunch of current comments, then all of a sudden a bunch of comments from a while ago. I do remember that comment by francopoli from 24 days in my chatter feed as well because I looked it up to see it there was a current comment attached from that whole OP. I didn't see one. I don't remember the rest but I thought they were from around that time period, 24 days ago.