itch.io

It does look that way, but I'm almost positive that's intentional. The trifold is designed for being printed out, so the "Cover" (ie page 1 of 6) is the rightmost entry on the sheet with the last two pages (5 and 6) to the left of it. That's perfect once it's printed out and folded, but on the screen it makes you pick between skipping the first page or showing the last two right up front like the author did here.

There are a few ways to handle a one-folded-page design. This layout is a viable option. (I used the same setup in one of my Jam entries, Berling 198x)