Hello there @kian42433!
Per your screenshot, that looks like your material has very low roughness, or no roughness at all, and maybe even a bit of metallic, thus making the engine interpret the area as covered in water. Let’s take some steps to resolve this:
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Please make sure your material has a roughness map in the first place. And if there is, it could be inverted, check your import settings
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Next, in the roughness map settings, make sure that sRGB is unchecked, and set compression to Masks
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As for metallic, it should be set to 0 for anything that’s not actual metal
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And for the normals map, double check that the green channel isn’t inverted. You can also try unchecking “Flip Green Channel” in texture settings, if shading looks weird
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Finally, just to rule other factors out, test your material in asimple lit environment (Directional Light + Skylight, nothing else). If it looks fine there, then your scene’s lighting setup might be generating the wet effect
but its random and everytime I restart the ue it will be bigger or smaller and sometimes other part of the map are like this
Im also using automaterial with 9 material but this almost 80% of the map is this material
If it looks darker in unlit mode too, you may have the same problem this person had. Weird Landscape shadows (also in Unlit Mode) with and without RVT - #3 by Micsa_Dan I think they solved it by:
unchecked Enable Edit Layers In the Landscape Details Settings → Paint Mode → Painted with main layer of my landscape material it disappeared as I was brushing on it
thank you so much I fixed it 