*don't listen to me!* lol
Sounds like it is showing your sim phone book, mine does that too. Since it only allows one number per name I'll have the same name 4 times with each of their different numbers..
Do what JS said, and that should solve it :P

Sim card phone books are a pain =D

The Cell home and work would be the entry on your phone, and the separate ones would be your sim phone book