I have noticed that for a few products on http://thomann.de, the star rating in the results ends up being half of what it should be as the score from the site ends up being interpreted as out of 10 by kagi (screenshot below shows a 4.5 rated product as being 2ish stars.
Steps to reproduce:
Search for "Thomann Polybrute" (https://kagi.com/search?q=thomann+polybrute)
Should show 4.5 stars out of 5, and have text "Rating: 4.5/5" instead of "4.5/10").
Brave Browser/OS X/United Kingdom/EUROPE-WEST