I am having major issues with duplicate urls. One being the correct url and the second being a error=404 and the title of the incorrect duplicate shows "404 the requested product does not exist"

I have the search for all error=404 in Mange SEF URLS and delete them and clear cache and then a couple of day later i have a lot more recreated.

EG 1:

SEF URL: shop
Real ERROR URL : index.php?option=com_virtuemart&error=404&Itemid=121
Real CORRECT URL index.php?option=com_virtuemart&Itemid=121

EG 2:

SEF URL: shop/tripods-monopods/gitzo
Real ERROR URL: index.php?option=com_virtuemart&error=404&view=category&virtuemart_category_id=16&virtuemart_manufacturer_id=29&Itemid=121
Real CORRECT URL index.php?option=com_virtuemart&view=category&virtuemart_category_id=16&virtuemart_manufacturer_id=29&Itemid=121

Also a lot of errors seem to be on the following SEF URLs/ "shop/list-all-products/"

Please advise ASAP

Hello? Any feedback would be appreciated.

Hello,

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