it wasn't clean install, when you still have stuff affect your game , that's exactly opposite of clean.
unistall game , go to file explorer, delete files related to witcher 3 manually, then in documents delete witcher 3 folder .
only then it would be considered clean install.
to see mods installed, go to Nexus, download history and preview each mod , it will show all files names , which you can reverse delete.
(people don't really use this forum, to answer future questions, you might want to consider reddit, or discord for faster more reliable answers.)