help.....transfering contacts

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hi im kind of new to this and i was jus wondering if anyone could help me with my problem. when i flash a new rom i use pim backup to restore everything. and everything looks fine but when i look at my contacts i find that i have at least 5 of every contact. what am i doing wrong. does anyone have a solution. and if anything does anyone kno a way i can at least delete multiple numbers at once.. please please help. right now im sitting with 2000 contacts