Ah, I see. I haven't played in two years so I can't really help you that much, sorry. Maybe there's some conflicting mods that cause the issue. Or you could try changing the water parameters and see if it stays like that.

appreciate how fast you replied. i am in fact using it in the theme editor ingame, ill try to write more accurately (english isnt my first langage srry). once i open the theme in the editor, it looks normal but when i save a copy ( i dont even need to change any parameter), and run a new game with the copy, the water looks non-reflective unlike your original version

I think it should be possible? I haven't played the game in a long time, but if I remember correctly once you download a theme you can open it in the editor to change what you want.
You could also use mods like Theme Editor to do so in-game.

is there a way to modify this theme in the editor? i wanted to change the temprature minimum and maximum but when i start a new game, the water changes from the original

Loll

This little cubemap gonna cost us 55 years.