endorphin I don’t think I was getting one per addressee
That was just a guess.
I didn’t stop to count them, because it wouldn’t be as simple as 4 new posts with 10 recipients would generate 40 notifications. Only the first post triggers notifications, but they could possibly be triggered for each of the recipients – so that would be 10 notifications not 40.
Anyway, if it’s already fixed in the preview, understanding the reason is fairly academic (but if it was still a problem there, it might have helped to track down the reason).