On the topic of tracking, you might want to check your browser extensions as well. I discovered tracking codes inside a browser extension back in 2013, and I doubt that it would be the last one: https://paradite.com/2013/12/07/solved-issue-with-vglnk-all-... (Ironically by visiting my blog post you are contributing to tracking by Google Analytics)
That's interesting, where's the opt-in for that on your blog? I don't see a modal that asks me before transmitting any of my data, or even giving my IP to a third party, or doing any tracking, as is required by EU law.