[Karellen]

Here is my tvshow.nfo content of stranger thing 

Thanks.

Hmmm... What software did you use to create these nfo files? They are not fully Kodi compatible.

There are tags in the file that Kodi does not use
The <episodeguide> tag is using v1 API, but Kodi has not used that for 3+ years. It uses v2/v3 API
Rating tags are wrong
There is no UniqueID which can break your library.
Also because you have the TVDB <episodeguide>, then you need to have the TVDB scraper active.

If all your nfo files are like this, I strongly urge you to delete them.