Odd 404 error when updating products.

[socks]

This happens in the product management section.

 

When I update the quantity of a product, sometimes it goes to:

http://www.example.com/administrator/index.php?controller=AdminProducts&token=randomnumbers&id_product=274

Instead of

http://www.example.com/administrator/index.php?controller=AdminProducts&conf=4&token=randomnumbers

leading to a 404 error:

 

It looks to me that it could be a server thing, as there were no changes in AdminProductsController.php or any core files.