First off, make sure you have the latest video card drivers installed. Secondly, make sure you have the latest version of your web browser installed.
If that doesn't fix it, please tell me which video card and web browser you are using.
So, i find something, if i open artstation with Opera, its fine, Think problem with Chrome, i have instaled last version of Chrome from Google, when i reinstaled my OS.
I can confirm I'm having the same issue. When you turn on the map display it looks as if the Albedo is being placed in the reflectivity and vice versa. It also seems like the uvs are somehow getting messed up as well.
Sometimes if you've had your web-browser open for a long time, WebGL can get a bit messed up. If you're seeing weird stuff, try restarting your browser as the first step.
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But if i close up:
Its looks okay.
If that doesn't fix it, please tell me which video card and web browser you are using.
ps. got nVidida GeForce GTX 760
https://www.artstation.com/artwork/gXVve