Last import in Address Book abnormaly huge

Last import in Address Book abnormaly huge

I just made a synchronization through iTunes of my iPhone onto my MacBookPro.
From memory I made about ten modifications on my iPhone. Unfortunately
they are not in the relevant group, but within All Contacts.
I thought it will be natural to find them within the group Last Import.
But they aren't there.
Moreover, on a total number of entries of about 600, more than 500 of them
are within this Last Import group.
This is a huge problem: where I'm expecting 10 entries to place in the
right group, I'm facing a list of more than 500.
What is the real usefull function of this Last Import group? What may I
did wrong to get such a huge Last Import.


I tried to simplify this huge problem by creating a New Smart Group… based
on rule:
Card was updated after Aug 15th 2013
But this smart group is still abnormal: 73 cards where I'm expecting no
more than 10.