Hello @Filip ,
Thank you for posting here.
After my research, it seems the wired characters in registry is related to browser or browser plugin, you can try to check it on this machine.
Here are two similar case for your references.
Regedit shows strange Chinese characters in my system - should I be worried?
https://security.stackexchange.com/questions/31750/regedit-shows-strange-chinese-characters-in-my-system-should-i-be-worried
I've got very strange HKEY_USER registry keys.
https://social.technet.microsoft.com/Forums/Lync/en-US/ecf3575c-57e6-4b03-b078-53ca62749c65/ive-got-very-strange-hkeyuser-registry-keys?forum=win10itprogeneral
Hope the information above is helpful.
Should you have any question or concern, please feel free to let us know.
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Best Regards,
Daisy Zhou