Keep getting multiple duplications

[jdcaddell]

OK guys so i have a question here that is probably pretty simple to answer and i just keep missing it. I have have a number of droids in the last 2 years from the og droid to the razr with many more in between along with other phones like the iPhone. My question is that i have noticed when i switch back to android a good majority of my contacts keep duplicating themselves in my address book. Is there a way to cure this problem? I am just curious because it is becoming a bit of a nuisance for the few times a day that i have to go into a contact and search through all of the layers.