Meeting recording: sound and video tracks from different presenters are not in sync

Dear all,

in a 90 minute recording of a webinar with two presenters discussing, the webcam and audio track of one presenter is faster than the one of the other. So after some time, they become more and more detached, which makes it impossible to understand the conversation.

I experienced this before and therefore did an audio capturing with another software parallel to the meeting, so I at least have a decent sound file, but it is of course not matching the video.

Is this a known problem? Do you have any solutions for this?

Kind regards