Hey Mike,
first of all, thank you for the purchase!
I’ve double-checked the theme and it seems to be displaying categories in the chronological order, as intended. On the page you’ve provided, the two posts also seem to follow in the chronological order (which also matches the order in the blog): according to the post meta, the “Fatoumata Diawara” post was created on the 12th of January, 2013; and the “Joe Thompson &..” post was created on the 30th of July 2012. Could you please let me know if I understood the initial question correctly?
Sincerely,
Andrew / Satori Studio