What kind of notifications are you seeing?
Perhaps you are being quick mentioned and deleted.
For example, if I do new post right now mentioning you with @gerry, I still got 5 minutes to edit this post and erase you mention without triggering the edit history, showing that I had mentioned you and removed the mention.
This 5 minutes gap is useful to keep the edit history clean of sequencial minor edits. But can allow triggering the mention of someone and deleting without keeping a history of it.
Also, I just noticed this rule:
Read the topic for more than 4 minutes
Perhaps you read these topic more than 4 minutes.