Hi,
Open this CSS file:
/components/com_virtuemart/assets/css/chosen.css
and look for these lines:
/* overwrite the element.style only necessary for the beez standard template, you may remove it */
div[style]{
overflow-x: visible !important;
overflow-y: visible !important;
}
remove them completely.
The problem will be gone.
Regards.
Support & Development