Please show all the filters and all the related fields for a lead you believe should've run through this. It's not possible to know whether they should've qualified without more info.
The way you set it up is not the way I would do because it's very hard to debug.
Instead, use your test smart list with these exact same filters, and check it's not empty : In your smart campaign remove all the filters and simply add one "member of smart list" -> in the test smart list.
Then go to a couple of leads that have been throught the SC and look at the activity log. Search for the "deleted lead" activity and display the details. Copy and paste the screen how here. I suspect you are trying to delete leads from SFDC while they are not in SFDC, which creates an error.
Your flow step should havea choice:
- if SFDC type is not empty -> delete from CRM
- default : do not delete from CRM.