The Tile Grid can contain one-off Tiles, Library Tiles and Posts. For Library Tiles and Posts, there are options to hide any of the elements of the Tile. In this case, for Tiles 2 & 3, a Post and a Library Tile, all but the image have been hidden to leave the Tile’s image, linked to the full Post / the Tile link.
Welcome to image alignment! If you recognize this post, it is because these are blocks that have been converted from the classic Markup: Image Alignment post.