We match both on the eBay Title and the eBay item number.  If one changes then we update it.   For this reason it is important if you Re-list an item then you do not also update the Title while our system picks up the new listing.  After the item is relisted then the Title can be changes after 1 hour.  You can always check what eBay item your huboo listing is linked to in 'Listings with huboo'.   It is also important to only have one item on eBay with the same title.  This is eBays requirement also.  For example if you are selling a used and a new item, then ensure that both have different titles : e.g. 'used laptop'  and  'new laptop'.