Hi,
It is because you are using a 3rd party Virtuemart Template and that template already comes with a Zoom Effect (another one) which creates a conflict issue.
Please provide me your joomla admin account to This email address is being protected from spambots. You need JavaScript enabled to view it. and let me fix that issue and make everything ready for you.
(while emailing to This email address is being protected from spambots. You need JavaScript enabled to view it., don't forget to include this forum post's URL at the top of your message to avoid any possible confusion in our end)
Regards.
Forum Support.