The Dyad 2 theme is responsive. That means that it’s appearance will change depending upon the size of the screen on the device used to view it.
When viewed on my desktop PC monitor, your homepage does display its first two posts in a row (or two columns), just as the Dyad 2 demo does, with four tiles across (image, content, image, content). On a somewhat smaller screen it would display with two tiles in a row (image, content), and on a phone it will likely display in a single column where the images and content are stacked on top of each other. This is expected behavior determined by the theme’s responsiveness to screen size.