Hi Chruan. It's because my tilesets are optimized for RPGMaker. So the textures are Autotiles-Ready. 24px border, 48px seamless texture, 24px border. Is there a autotile function in unity?
unity doesn't have this feature, and the tiles are missing a lot in unity if they are split 48 by 48. It works differently than RPGMaker, your tiles are great, but I couldn't turn them into great maps in unity.
There is a RPGmaker autotile importer for unity to import tileset from RPGmaker. But you could also change the grid size to 24px for using the autotiles.
A5 are simple 48px textures. You don't need a change there. A1 is animated water and also a autotile except the waterfall. You can split the waterfall vertical 3 times for a smooth animation. I hope I could help.