Irregular E-mail alerts from this forum, anyone?

[capoverde]

E-mail alerts are coming irregularly from this forum, as reported by Whadar and myself. Today in a thread two new posts came in after mine, but I've got no alert; however two days ago an alert arrived normally for a new personal message, so it seems my ISP isn't at fault -- anyway it usually notifies me of any anti-SPAM or anti-virus blocking action (and normally SPAM comes through nicely).

Flash (admin) has suggested me to post this issue to the forum: has anyone else this same problem and/or ideas about the possible cause? Thanks.

*Update: I just found an alert for a new post in a thread where I posted today, but in fact there are eight new posts! This seems to confirm that my ISP isn't at fault.