Weird sound when I plugin earphones in iPhone 4?

I recently brought some earphones with a mic from amazon, but when I plug them in my iPhone it sounds like its filtered, on some songs I hear the vocals only and other songs I only hear the instrumentals,

They work fine on my iPad 2, sometimes when I pull them out of the jack abit, they work,

CAN SOMEONE Please TELL ME HOW TO FIX THIS Please Thanks

I guess its not supporting the device… Have you marked its for that device.

sometimes it happens that the pin does not fit properly…

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