You probably clicked "yes" when it asked you "subscribe to this topic". The "unsubscribe" function doesn't really work in my experience - it just seems to remove you from the (infrequent) general mail, not all questions, or notifications on your own questions.
Look above this question for the "topics" section and you'll get a list of all available topics, with the ones you've watched listed first. Click on all the "unwatch" options next to them, and that should stop most of it.
You also watch all your own questions and any you've deliberately watched so when you get one of those, go to the question and click "unwatch" at the top right.
I'd be tempted to raise a questions issue about "unsubscribe" not working...
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