yeah in that case you have doubled contacts on your phone --> like on android you can change the contacs-view --> grouped by number or show only stored on sim.
I think you have the problem that parts of your contacts are stored on the phone and another time in your google-account.
I had the problem with a new android phone --> i inserted my old sim and synced with google afterwards --> i did not see any duplication in my contacts because the default settings only showed the google contacts