I have taken a look and to me it seems that you are not consequent with dates when it is about publishing. (yes I understand that this is probably a new site and you have added all postings at one moment, but just 'act' as it was posted on those days/years.)
Take a look at the publishing dates of the
postings. I would change ALL those
publishing dates to the year it was actual.
Meaning by that:
- The posting for 2001 has
Published: February 19, 2001.
- All others have
Published: December 8, 2015. (seems not logical to me)
A little (very)simplified example:
WordPress request data from the database and the database only "knows" in this case 2 things;
- I have 1
post dated with 2001 and 9 dated 2015.
- WordPress did a request and I deliver (by Publishing date in this case): in order of year, is the year equal than I look at the dates, are those equal I look at the
times(and they are for 99,99999% never equal).
By changing those years to the "correct" year (in your case 2003/2004 and so on) it will probably solve your problem already.
posting, in the
Publish 'section' at the top right (the
meta box) you see
Published on: select
edit and change just the year, click okay and click now the
I can be totally wrong, and if so, please let it know and maybe we find another (correct) solution.