Hello Raoul,

if the links point to same page it will be a duplicated content.
I'm not sure about your setup using sh404sef, it seems that the 2 links: http://www.hollandhardware.com/en/brands-en/avaya

and
http://www.hollandhardware.com/en/sell-new-used-and-refurbished-apc

point to different contents.

However the fact that you get more links or 2 version of links could be due to the power of JSitemap to include links directly from contents also if not linked to menu.

Of course if this in your case lead to duplicated links, exclude that links or try to unpublish the data source for contents,

Best regards,
John