Hello again!
The fact that the wall block resolution is 48x48px is correct. That's because that piece of wall is designed using 16x16px tiles (the tile dimension we use in all the asset packs of our brand). The wall block you're copying and pasting is designed in such a way that you can use its 16x16px tiles to compose walls of the size you want. By repeating its tiles, you can create walls as tall as you want, and as wide as you need too. Look at this picture, the transparent tiles are those I repeated to get a larger wall.
In our demos, we have created the walls using 5 tiles in height. That's why they are taller.
(Open images in a new tab for closer viewing)
All our tilesets are designed in such a way that their 16x16px tiles can be "divided" to compose objects of different sizes, and even make them look different. It all depends on how you arrange the tiles that make up each object, like a puzzle in which all its pieces connect with each other. They are very dynamic and versatile packs :)
We hope this explanation has helped you. If you have more questions, don't hesitate to contact us!
Cheers!
PS. At the moment we are not taking commissions but as soon as we enable it again we will get in touch. We will announce it on our social networks too.