Hey Fotis, thanks, you do D*** good work! But are you sure you did not forget a little something in the 2.7 upgrade running in 3.5 Joomla , The item links show the video, and the photo gallery, of the items you are trying to link, does this in three different sites on me, it does this, before, it always showed only the item image, .... It is probably something I am doing, but I thought you should know, regarding your work, ... isn't it your brother who is the real brains of your operation ( humor intended) thanks.

I will answer in Fotis' behalf.
First of all thank you :)

Depending on the template, the item links will only display the links (as the name suggests).
If you want the links to show all the item's content, you need to edit the category_item_links.php file and make it like category_item.php

Remember to backup first and always use overrides getk2.org/documentation/tutorials/174-templating-with-k2-and-the-concepts-of-sub-templates