Mandatory information about my setup:

Have I searched the tickets before posting? No
Have I searched the forum before posting? No
Have I read the documentation before posting (which pages?)? No
Joomla! version: 2.5
PHP version: 5.4.29
MySQL version: mysqlnd 5.0.10
Matukio version: 5.0.9
Direct link to the page that shows the issue: http://www.skin.com.au/events3


Description of my issue:
when ever I book an event the person booking the event recieves duplicate confirmation emails. I have no idea how this could be solved. any advise would be very welcome