Well, it does meet the recommended system requirements. And one thing is for sure, the white color that I'm trying to fix has nothing to do with the hardware. The greenish/reddish rocks aren't related to the hardware either, since I haven't encountered them on other planets except for the one I created. As for the export textures bug, idk what to say, since the bug occurred even when I exported at 1024 pixels.
To troubleshoot this kind of issues some things are needed, like a copy of the se.log file available in spaceengine system folder, a copy of the script files in planets folder and stars folder, the exported textures.
Since latest optional drivers from AMD have issues with SE because of their OpenGL implementation, it should be noted that AMD drivers different from 22.5.1 are not recommended right now.