Hello,
Thank you for choosing our template and by default on mobile devices it looks good, you can check below link
(as example we use responsinator for testing)
www.responsinator.com/?url=http%3A%2F%2F...com%2Fvirtuemart9%2F
So, you have customized it and broke structure, seems problem in new elements, which have been added.
To solve problem need make new responsive for template.
Best Wishes,
Taras
OrdaSoft team