HubSpot will never create a contact that is merely visiting a page. Can you navigate to the contact record, click the View all properties button in the left sidebar and search for Original source?
Additionally, if you could scroll to the bottom of the activity stream and let me know what you see there, that would also help.
Feel free to share screenshots of what you see there and I can help you interpret the information.
Hey everyone! Struggling with the same issue. The record source says “tracking code interaction” and the first activity (which creates the contact) is a page visit. Something odd is going on here and I can’t explain why. @karstenkoehler