Why can't I find half. My phone numbers when I type a name on the keypad screen?

For some reason I can't see all my numbers when I try and use the number pad screen to do a quick search for a number. Eg if I go to the number pad and use the numbers to type in dave I get 3 daves from my phone book but if I go into contacts I have 5 daves saved. I suspect it's cos some of the numbers are saved to the sim card or something but I haven't been able to find a way to move them etc. Have tried exporting them to the phone or Samsung account but they won't show up unless I go the long way through the contacts menu.

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