[hewwra]

In the tvshow.nfo it doesn't even say tvdb´instead it says: rating name="default"

That's expected at the moment.

Ok, may I ask what system you're using? The developer information in MediaElch's "About" dialog would be helpful.   

Why is that expected? in my other shows it says:

xml:
<rating default="true" max="10" name="imdb">

MediaElch 2.6.3-dev - Ferenginar

Compiled with Qt version 5.12.3 (64 Release, GCC 5.5.0)
Using Qt version 5.12.3
System: Windows 10 (10.0) (x86_64-little_endian-llp64)

Application dir: C:/Program Files/MediaElch_win_2.6.3-dev_2020-01-03_18-00_git-master-f7e762f/MediaElch
Settings file: \HKEY_CURRENT_USER\Software\kvibes\MediaElch
Data dir: C:/Users/Privat/AppData/Local/kvibes/MediaElch
MediaInfo Version: MediaInfoLib - v19.04