I finally figured out what the problem was
Apparently, if you use a previous Bluetooth USB Adapter, and then replace it with a new one, the system still detects the USB still being functional in the PC (Even when the USB is already replaced) You want to open up Device Manager>>View>>Show Hidden Devices,
then you want to click on Bluetooth and it should show the old Bluetooth USB drivers, and you're gonna want to delete the drivers that have already been replaced then your headphones should finally disconnect by its self.
(P.S after you do this, you want to reconnect your Bluetooth USB Adapter for one last time and it should detect your headphones when you pair it again.)
Hope, this was helpful.