Bluetooth headphones are connected by someone else, how to fix it?

Bluetooth headphones are connected by someone else, how to fix it?
Normally Bluetooth connection is no problem. One day, I opened my headphones. On one side is the song we played. But who's on the other side, where? Confused... two sides, different songs 1. Try turning it off and on again, it doesn't work.
2. Disconnect from the control center, not lost.
3.Cancel pairing Pair again, not lost.
4. Keep it in the charging box. Then open it again, it doesn't disappear.
How to get the headphones back to play our songs on both sides? Has anyone ever been able to fix it?
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