Zoom screen jumps over to Zoom Web Page after about 1 minute

[Fleming]

I have a Mac desktop and ever since the last Zoom update, ( a week or two ago) about 1 minute into my class the Zoom video jumps over to the Zoom post attendee web page ( i think that is the one).   I have to find the Zoom icon in the list at the side on my Mac and click on it to restore the zoom video. i have tried clicking elsewhere and it doesn't fix it. This always happens yet  only happens once each zoom session.  Drives me nuts!  I use a free basic Zoom but the live class I attend is hosted by people with some type of membership.  My Mac is up to date.  OS Catalina

Thanks for any help you can offer.