That's certainly odd! Have these devices ever been connected to your TV? You should be able to remove devices from the list. Here's how: https://yt.be/help/ZRYQ . Hope this helps.
Replying to @peonyjana
To help us better investigate, please login to the account experiencing the issue and send a feedback report directly from YouTube: https://www.youtube.com/tv_feedback . You may not receive an individual response, but the details will help us identify and fix any issues, thanks!
2:58 PM - 22 May 2019
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