Some of the subscriptions of my filters I have configured for one group, are sending duplicate emails at the same time that I have designated them to be sent. I notice two things about this:
1. The results are completely identical.
2. The bottom of these emails have the same messages: "This message was sent by Atlassian JIRA (v9.4.14#940014-sha1:734e682)"
eMail 01:

eMail 02:
Outlook: