It seems like when a user edits or deletes comments, this is not emailed as an update. This means that the information in the emails does not reflect the actual information in the forums.
Please, consider either:
* Wait for a short while with sending the email, to accumulate all changes by the user in one email. Not sure how long, but something like a few minutes.
* Or send an email for every user operation that affects the forums.
Customer support service by UserEcho