It could be a lot of things, and as RiddleMeThis says, a DB search would shine light on the situation.
However, in my experience, most cases of unexpected meta are generated with Yoast.
For your specific case, here is how to link Google Search Console with Yoast – it might help you remove the unwanted meta:
https://yoast.com/wordpress/plugins/seo/add-website-google-search-console/
Let me know if it doesn’t work, and we can dive into searching the DB!
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