You might have noticed already that Steemit is out of sync and is showing data from 2 weeks ago.
While I'm not 100% sure on what's going on - my best guess is:
Since api.steemit.com (the server where Steemit is getting all your data from) is using a caching layer called Jussi to increase the speed and scalability of Steemit.com - the chance is high that this layer is currently undergoing a resync.
Now the interesting thing here is: the new (aka created) category is still showing up-to-date posts from the present - but those are still displayed as 13 days ago.
Whether this is wanted or forced through an error - I can't say.
But for now ...
Enjoy the ride to the past.
However - if you want to go back to the present: use https://steemitstage.com
Learn more about steemitstage.com in this post: Steemit.com is down? Use steemitstage.com