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on some songs, yes, the separation between audio channels is discernable. But if you are referring to the general loudness of sound then they should be fairly equal. have you checked that you have plugged in your headphones all the way?
not so quick my friend. have you checked via Nokia suite that you have the latest firmware installed on your device? if there are any updates, please update to the latest version offered. failing that, you can Restore your phone to factory settings, and if that still isn't working, then re-install your current firmware thru Nokia Suite.
failing all of that, you will need to take your phone to your local Nokia Care point for them to inspect: http://nokia.com/support