NO next and previous buttons in images on product details page

[big2000]

Hello, I'm using VirtueMart 3.0.6.3 and Joomla! 3.4.1. All my images are shown in modal but there isn't navigation buttons. Is there any solution? I have read other posts about this but they didn't resolve my problem (or I'm stupid:). You can see my product details page : http://sklep-getlucky.pl/test-detail. Thanks in advance for any tips.

[liquid.ideas]

I can see navigation buttons within the modal although only one product image to navigate?