problem with audio skype NDI source in OBS

[houssemhammedi]

hey guys, I'm trying hard to find why the sound is repeating when i add a guest via skype Ndi. the guest sound is echoing and repeating even he uses a headphone and i use a headphone too>>>please help me and sorry for my English.
video link here to understand the problem sound repeating and echoing problem with skype ndi in obs