Is there any way to fix this audio leaking problem?

So have you now rolled back to Windows 8.1 or are you dual booting Windows 8.1 and 10?

Did you try the suggestions at Audio falling behind capture card recording - #15 by cyrano and the post following of using a USB mixer or the Xbox Windows 10 app ?

As I asked, are you sure you are choosing the mic input in Audacity? Doing so is not always obvious with a combo in and out port.

Have you tried disabling the internal mic? Sometimes there is a setting that combines the external and internal mic into one input. The internal mic may hear your headphones.


Gale