I just got my new m50x. I'm new to this audiophile world, Coming from Philips O'neil bend headset and Skullcandy navigator.
I have been testing m50x a lot by downloading flac version of various songs and also those that I know every beat by heart.
At times a particular beat like guitar/drum/flute/maracars (thingy) appear on just one side for some particular songs and for some songs one side in particular is tad bit louder. I also tired interchanging their sides which helped at times for few and other times didn't.
If I change the mode to mono from stereo(which I seriously don't like) then it seems to be fine.
I would like to know whether its a problem with my headphones or something else.
Well the thing is I used to rarely notice left/right panning in Skullcandy and O'neil unless I listen to some sort of relaxation/hypnosis on youtube.
I did m50x headphone testing online for all sort of frequencies and panning. It seems to be fine. Like you said may be it's just more clarity or so in m50x which makes it easier to notice.
By the way I got these because my other headphone's detachable wire broke. I tried swapping with Samsung's stock earphones and the interesting thing is few beats ( in flac files) which were panned left/right in m50x where exactly panned opposite in stock ones (which I could hear only if I concentrate little too much) and also if any side was slightly louder say left in m50x then it was right in earphone. (Yes, I was wearing correct sides with earphones. I double checked)