Terrain brush confusion

Hi, Can someone please help me with the terrains?
I’m trying to use the terrain brush, but it glitches out and gives me the wrong results. Also I can only target the corners of the grid in the editor.

This is what the first one produced on the map when trying to paint some water on the grass.

I tried making it a mixed tileset and then the brush was even worse and whenever i click on the map it doesnt highlight just the little square im trying to change, but like a random area around it and screws it all up. I have no idea whats going on.

As far as I can see (bit difficult because of the terrain colors) that tileset png only allows you to draw rectangle shaped water (on grass).
You can try to manually find tiles that fit into the nasty corners but I doubt you will find any.

Edit: Still - not sure, hmm, I could be wrong…

nvm i just realised i dont have outer corners for most of the tiles

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