The dirt and grass tile sets are the same resolution. Maybe you accidentally changed the resolution while opening it in some software. I suggest you re-download the assets.
Maybe thats true, I will try to download again. But just for clarification, I am not using the paid version, just the free for now.
I found that the dirt tile, although similar, looks a lot smaller, I will put the tilesets in imgur just for examples.
Dirt: https://imgur.com/a/zrA5Biw
Grass: https://imgur.com/a/xEH5Wjz
I don't think the tileset is wrong, I think I am doing or seeing something wrong, but look at the single tile, it looks a lot smaller on the dirt tileset.
