you should get you ears checked, maybe your left ear draws more amps.. I know it is very scientific, but it is caused by how you eat popcorn...
But seriously, most likely just the headphones you are buying I have had a pair of kickers that I use all the time, had them for a while and they are still perfect, and SUPER CHEAP, come to think of it, I don't think I ever broke a set of headphones, BUT then again I dont eat popcorn, it gets stuck in my teeth and messes up my tv reception..