Front End Web Development track course order differs between Treehouse website and Android app; which is correct?

Greetings. Last night I went into the Treehouse app on Android for the first time in a while to quickly check something and found that the order listed for the courses was different from the Treehouse website.

I won't list all the courses that are different but I'll just put up a few just to show you how different things are.

Here's the first courses listed here on the website:

-How to Make a Website

-CSS Basics

-JavaScript Basics

-CSS Layout Basics

-Responsive Layouts

And here's the first courses listed on the Treehouse app:

-How to Make a Website

-CSS Layout Basics

-CSS Flexbox Layout

-CSS Selectors

-CSS Basics

-JavaScript Basics

The app differs greatly, as you can see. I'd also like to point out that the app seems to be grouping courses together and there's even little padlock icons found after certain courses, which give the impression that one should not advance to that course before completing those before it.

I can only assume this is a new revision of the Front End track, especially when a couple of new courses were added to it recently so I find it strange all these changes and additions are not showing up on the website. Is the course order from the app the new way of going through that track?