Thanks for your reply.
I have always left the top URL box blank. The canonical URL's are set to add automatically, so every product I add has a canonical URL. This is also confirmed in the HTTP header and they are all working correctly.
My problem is that Google seems to be crawling links and I don't know where they are from. So, where could it be finding the following link?
/index.php?option=com_hikashop&ctrl=product&task=show&cid=5812&name=vandalhanoverblack&Itemid=107&category_pathway=21
Interestingly, this only happens with one category (van dal).
Another point here is that I have canonical tags on all of my product listings, why would google ignore these? In fact, it's a bigger problem than that. At this moment during a live search it's prioritising the link that I shared above instead of the following canonical URL: /womensshoes/product/vandalhanoverblack
In summary I have two problems.
1) Google are ignoring my canonical link
2) Where are they finding these /index.php?option=com_hikashop... URL's.
Kind Regards,
Hal