I am trying to figure out some sort of mathematical pattern to the error, but no joy.
The post for days 27-14 display the correct photo for that day.
The post for day 13 displays the photo for day 23.
The post for days 12, 11, and 10 display the correct photo for that day.
The post for day 9 displays the photo for day 20.
The post for Day 8 displays the photo for day 18.
The post for day 7 displays the photo for day 17.
The post for day 6 displays the photo for day 16.
The post for day 5 correctly shows the photo for day 5.
The post for day 4 displays the photo for day 24.
The post for day 3 displays the photo for day 23.
The post for day 2 displays the photo for day 22.
The post for day 1 displays the photo for day 11.
Does this help?