Speakers problem topic

I was unable finding anything about this problem so I decided to ask you guys here. So the thing is that my top speaker is louder than my bottom one. For example when I watch movies/videos in landscape mode I can always hear the sound coming from the left (top) speaker louder than the right (bottom) one. It's as if there is a small subbuffer integrated to it or something. By the way if I watch movies or some clips on youtube and decide to turn the phone clockwise even though the top speaker is located on the right and the bottom one - on the left, the audio is always like this top=left and bottom=right, so I can't decide wether or not it's a software or a hardware issue. So is this a normal problem? Is it possible that you guys have it but dont notice it? Is it a software or a hardware malfunction? Is it fixable?