Visal Composer Tabs and Products Block problem

Hi,

thanks for your great product.

Using it I encountered a problem. I tried inserting project blocks in the visual composer tabs but every time I step from one tab to another, the project block is not shown but I only see navigation arrows. When I try to analyze the page with the browser tool strangely the projects appear. I don’t understand the nature of this problem and I would like to ask you if you could suggest a solution.