iTunes U weeks sorting

Hello,

I have a question related to iTunes U iOS app. I have subscribed to several courses and some courses have correct weeks order:

week 0

week 1

week 2

week 3

…etc

and some have inverted order:

week 18

week 17

week 16

…

So on tab Posts I see the newest entries first and older later. So I have to scroll to the bottom of the list all the time.

Why does it happen and is there any way to change the sorting order?

Thanks in advance.