I’ve noticed this happening recently, whenever the CWP makes a topic which will generate a notification:
This has occurred on another instance of mine as well, as a topic in a watched category.
I’ve noticed that the notifications condense down to two once read, which is reassuring.
However, they also seem to generate an additional notification email - this is much more concerning as most @admins will be blind to it as most have their emails turned off. I only realised this due to a test user which received the emails.