I made a main page with the page template “Introduction Above List” and selected “Grid (Thumbnail). The main page shows all category post and it works perfectly on all devices except mobile phones. On each mobile phone I tried always the first picture is not selectable and has no mouseover. I changed the portfolio list type to all possibilities and also changed the mobile columns etc. but it still doesn’t work. It’s always about the first post – all following posts are selectable and the mouseover effect works.