Ask HN: Is anyone seeing these HN Bugs?

Ive seen some things lately, but Im not sure if they are algorithms to revive old threads or not:

Im seeing old posts get revived. For example, these threads from hundreds of days ago are on the front page of ask:

http://news.ycombinator.com/item?id=973060 http://news.ycombinator.com/item?id=1556416 http://news.ycombinator.com/item?id=644956 http://news.ycombinator.com/item?id=1527010 http://news.ycombinator.com/item?id=1545774

Several show up on the front page two or even 3 times and all the comments are showing the same number of days ago.