Contact sync via iCloud

Hello,

I noticed recently that not all of my contacts were synchronized between my iPhone 5 and my MacBook Pro (Mac OS 10.8.2, btw). On my iPhone, some of the contact infos are stored on iCloud, and the others on the iPhone itself (I truly don't know why), and only the contacts on iCloud sync with the contacts app on the MBP. Does someone know how to solve this?

Thank you!