Hi
I have no answer for items overwrites but it is normal that article ID does not match the linked id (Article ID 9570 -> ::cck::9566::/cck::).
"9566" is the id of the item in #__cck_core and it is not equal to Article ID. The Article ID is stored in the PK column there. It is because #__cck_core collects all items across all objects (articles, categories, users etc.) where ID is a unique identifier and PK is ID of Joomla item e.g. article
Michal