Why does PoE steam client use 3 different locations for shaders?

Hey, this has been bugging me for a while now, i set the game to use a specific folder for shaders many leagues ago, but it still keeps using 3 different locations for all the shaders

This is the folder i specified to be used for shaders.


This is the SteamApps folder, and why is it 14,4gb?


And this is the main PoE install folder


In total this adds up to 18,83Gb of shaders you keep storing on my drive. I have tried to delete them, but they get added back in all 3 locations. And this seems very excsessive.