Well, you’re right it seems. The only difference is that on the main theme, it starts on page one and then moves forward. But on the mobile theme, you have to scroll backward to go through the older posts.
Take a look at the mobile theme category and scroll down to the paging option and see where it says ‘previous’ instead of ‘next’ on the first page.
It’s really no problem, I was just curious if it was supposed to be like that.