I don't see ads but if I were to, and despite all my precautions some would be on topic based on my past behavior I would methodically dissect to find out the leak. Namely I would try to automate the process :

• identify a place showing ads
• take an action, e.g. search or browser, on a verifiable unique topic (in order to prevent from generic suggestions, e.g medication during flu season)
• verify if the ads become relevant
• enable/disable any of the tools used, repeat