Recording The Internet is not recording VOIP, Skype or Chat. Those are special purpose audio applications and Audacity frequently has troubles with those.
Skype in particular has a number of special purpose applications available for recording both sides.
Pamela
http://www.pamela.biz/en/products/
And a few others.
https://forum.audacityteam.org/t/help-recording-with-a-mic-laptop-and-headphones/35068/6
Koz