Hi Kelly,
Hard to troubleshoot without being able to see your Sync to SFDC campaign logic, but a few things I'd check:
1) The smart campaign results tab > did any of the flow actions execute against them? You should see a line by line summary with details, if the sync failed (this sometimes happens due to field validation rules in SFDC for example) you'll see in the description "Failed" and then a note as to why the sync failed. Check this as a first step.
2) If there are no logs in the results, it's indicating that your members didn't qualify for the flow steps, therefore you need to check the Smart List tab, should be something like a trigger "New Lead is created" and a filter "SFDC Type is not Lead or Contact" (make sure SFDC Type is the Lead filter not the Company filter). The filter ensures it only qualifies for members that are new and not already in SFDC.
Let me know how you go with the above.
Cheers,
Carrie