recording

[Silvia58]

Hello, I am the secretary of an association, and for some time now we have been organising meetings on Zoom for members during which an expert gives a lecture, always using Power Point.
Unfortunately, a problem occurred during the last lecture: I started the recording, the speaker's presentation was shared and we all watched it, and some participants asked questions. When the meeting was over, the programme processed everything and saved it locally (a choice made for all recordings).
I checked the result, but while the voice was completely recorded, my desktop always appears in the video, only at the end does the last slide of the presentation show up.
I ask you what could have happened, we have another meeting next week and I would like to understand what to do.
Thank you