Welcome to the forum!
I think that you are going to have to provide more information before anyone can try to help with this.
1) How are the microphones connected? Are they connected to preamps or mixers or recording interfaces or are you just using internal microphones?
2) What kind of audio interface are you using? Is this with the PC internal sound card on a laptop or on some digital mixer, or on some other digital interface?
3) How are the headphones connected? are they direct to the PC or out of the audio interface or to a headphone amplifier connected to something somewhere?
4) can you see the interface in MC? What driver mode are you using?
Glen