i tried the headset on a laptop and it worked fine no probleme and like i said i pluged the headphone earpiece on front pannel and the other headset microphone in the back (motherboard) no probleme but when i pluged theme in the same place for example i pluged the earpiece for my main headphone in the headphone jack and the microphone from the other headset to the mic jack beside it , it gives the same problemePersonally i still think it's a issue with the headsets if someone has a laptop or some way of testing them on another device headset crosstalk seems more plausible after trying so many fixes.
Just to verify you tried to plug the microphone from one headset and the earpieces from another and it worked fine? If that's the case it has to be an issue with crosstalk on both headset's.