Welcome to the forums @"Alack Sunrider"!
Maybe it is a project setting override? I know some platforms have settings that lower or change shadow quality for performance reasons. Though, I think this primarily affects mobile platforms, so unless you are exporting to Android/iOS, then this shouldn't be an issue.
Regardless, I would maybe look in the project settings, just to be sure. I do not think that would be the issue, but since the exported game uses the project settings as an override over default settings, it may be something to look into.
Though looking at the picture, as it took me a bit to see, it appears there is some shadow acne. I don't remember what the setting is right off, but on the light there should be a way to adjust the bias. I would see if tweaking this value just slightly fixes the issue. That wouldn't explain why the editor looks different than the exported game though.
I dunno, but I will keep thinking about it in the background and if I think of something else, I'll let you know.
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