Latest postings not at the top of the page

Hi.

I have a blog using the 2010 theme being hosted by WordPress which has been running perfectly well for the last few years. But for the last few months, any new posts are refusing to display as the most recent despite that being the setting in reader and in the appearance settings.

It’s stuck on this post as the most recent
https://johnbrawley.wordpress.com/2016/02/15/olympus-em1-for-video/

Despite the fact I’ve published two more recently.

This one today
https://johnbrawley.wordpress.com/2016/03/21/ursa-mini-4-6k-carnival/

and this one after the one that’s listed now.

https://johnbrawley.wordpress.com/2016/03/08/olympus-e-m5-mark-ii-flat-profile-tested/

Any troubleshooting thoughts would be appreciated.

JB