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- "Opened Email: is not" means the lead opened any email, but not the one you listed
- "Not Opened Email: is" is specifically leads who did not open that email and includes those leads who were not sent the email at all and those leads who were sent the email but didn't open it
You will instead want to use two filters in addition to the member of program filter with "ALL" logic:
Want Sent Email: Invite
Not Opened Email: Invite
This will successfully generate a list of leads who were sent the invite but did not open it.