Annoying repeated emails messages

Hi all,

I tried to report this on twitter but it looks like I was not understood.

I'm constantly getting repeated mail messages. This is the scenario.

A team mate comments on an issue.
I get a mail message for that.
Team mate adds another comment to the issue.
I get the old comment email message again. Instead of the new one.
It keeps happening for all subsequent comments on every issue.

Can you please tell what's happening?

best regards