Products not displaying correctly, lightboxing

Hi! Thanks for this wonderful plugin.

I’m having issues with single product larger image, see here: http://novot.ee/siitan/wpcproduct/toode/ instead of displaying one large picture they display tiny versions of both of them in a larger box.

How to fix that? Also, what’s the best way to add a lightbox option so that when clicking on the larger image, it expands full screen.

Thank you and greetings from Qld.
Tina

https://wordpress.org/plugins/wp-catalogue/