Hi JALewis,
Can you tell exactly where do you apply the quick filter Owner+Member ?
This looks like a bug in SmartDL.
What happens when you manually add owner and members after selecting the "Only from" option. Does that work for you?
Is that group a part of a dynasty?
Please contact support for further help as it looks complicated to resolve here, please give some details about your environment and the group that you have problems with.