Output sound moves to the left speaker randomly

Howdy. I have a weird issue. I just installed the new firmware, everything is fine, except i went to test the sound vloume before and after the firmwre upgrade to see if it actually went up. After the upgrade I noticed that my speakers werent aligned properly, so my volume test was pretty much a failure. no big deal. BUT this isnt the first time that the speaker orientation of whatever has migrated to the left on its own. I once thought the headphone jack was broken cause i could hear sound only mostly in the left. and then i noticed a day after that the left speaker was louder too. I went to the sound preferences and seen thatthey were changed. I didnt even know this option existed so it wasnt me who changed it and no one uses my macbook but me.. This was 2 weeks ago. Today I found that the same thing happened again and it was all shifted to the LEFT.
Anyone know what is going on? I'm not changing it. Is there a shortcut key I dont know about that could be doing this? Is this happening to anyone else? Maybe everyone should check to see if its already like this, maybe thats why its quiet for everyone. It's significantly louder when the speakers are centered, i just dont know why it jumps..

BLK4BDK wrote:
Since I posted the question I have found my manual and do see what KC is talking about but what is the pinhole next to the earphone jack then?  its not labeled in the manual, as far as I can see.
It certainly is labeled.
Open the link I gave.
It is the "Top microphone"
The other is the "Bottom Microphone"
Both are clearly labeled in the manual.

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