My original headphones from Huawei p20 pro because the right side is quieter a lot quieter why?

My original headphones from Huawei p20 pro because the right side is quieter a lot quieter why?

Could be several causes:

No stereo plug
Setting in the mobile phone is not centered (stereo balance setting)
Defective - try other headphones
Try headphones on another device - it is there so there's a defect
Socket in mobile phone defective - bring to repair.

Clue where can I adjust this at huawei p20 pro

I do not have Huawei. But there's always a possibility of attitudes. Look for the symbol that looks like a gear, at least in a similar way, and then to the sound or volume, tone control or what is still possible. Must stop looking.

I already do not exist