For the first point, it seems to be linked to something specific to your Marketo or SFDC instance. look at the activity log of the lead in Marketo and check were this activity comes from. If it has been created by Marketo, you will be abel to identify the smart campaign in the log.
For the second point: admin-> salesforce -> sync options -> edit. Recommendation: deactivate most of the checkboxes. Keep only Sales email.
It looks like the activity is being driven by "sync lead updates to SFDC" but I'm not sure where this campaign lives in Marketo. I did initiate the enable SFDC campaign sync. That is the only box that is clicked in the admin area.
I apologize if this is an elementary topic, our team is super new to have synced systems!
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"sync lead updates to SFDC" is the standard and natural sync between Marketo and SFDC. This means that these activities are likely to be created by salesforce.