iPhone 11 earbud issue with right ear.

Hi, I was 3 months older with my iPhone 11. Originally it was perfect but suddenly wired earbuds went wrong. Right ear suddenly drop the volume. And the weird issue is once I flip my earbuds (left to right ear and right to left Ear) it’s perfectly fine. I don’t restarted couple of times. But didn’t seems fix the issue.. can u plz help me guys