I just got these MID ANCs and pretty excited about it.

But a weird thing happen, I was using the headphones on my computer (which was Windows 10 Pro) , it can be used smoothly.

When I switched to my phone, all of a sudden, when I activate ANC mode, the sounds goes louder for a split second, and then came back to normal. When I inactivate the ANC mode, nothing changes. I really want to know what

 happened?