Only a random few are missing, always the same ones
It seams like a cache issue or an issue with a group/account not syncing, try this
Backup your phone
Try exporting all you contacts out of address book
Reimport contacts into address book (just to be sure they all got exported and backed up)
Delete all your contacts out of address book
Sync and force the 0 contacts to your phone
You should have no contacts on you phone
Import all your contacts & force sync to your phone
Cross your fingers and look if the contacts synced
Also be sure your OS X software is all up to date before this also turn off contacts for any of the mail accounts on you phone before doing this
I tried looking for how to reset the address book cache but had no luck, I also did not look very hard but this could fix the issue.
I also just realized I assumed you are on a Mac, im sorry for you if your running windows, but that's your problem
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