Hi Sonny, big problem.
The fonts folder is not working anymore. I think it is because you move some folders from template to media folder.
Many people from EU use this trick and add their own fonts into this folder to avoid loading from Google fonts.
Here is the description what I mean ( switch to english)
https://www.joomlaplates.de/joomla-tips-und-tricks/google-schrift-deaktivieren.html
Greatings Peter

AND btw you cant downgrade from Astroid 2.6.0 to 2.5.20 because all files are already moved and not copied to Joomla/media folder