When adding myself (staff agent) as a customer under an organization to have access to the customer portal, this seemed to override any notifications I get as a staff member. We had to change the customer notification settings to only notify users of their own updates or replies to their own tickets. After that, I wasn't receiving any notifications for anything. When I removed myself as a customer under the organization, I started getting the staff notifications again for newly created tickets and new replies from clients. So, I'll need to re-add myself as a customer if I need to check something on the customer portal, but be removed from that list otherwise.  This seems to be a bug.