Sort function on category page puts "orderby" in search field

[gtcnetworking]

Can anyone explain why on my site the sort function does not work.

When you select a different sort order it puts "Orderby" in the search field and trys to search for that ?

see here on the site

https://www.nsoffice.com.au/index.php/component/virtuemart/view/category/virtuemart_category_id/705

try changing the sort order.

Anyone have any idea why it does that ?
thanks in advanace

[jenkinhill]

Joomla and VirtueMart versions?