Zoom scheduling across multiple calendars

[CC12-8]

Hi, 

For some reason, as of last week, when I schedule a zoom meeting it schedules it across multiple google calendars not just the one I want it scheduled to.  

When I unclick the other calendars in zoom it unclicks them in my main calendar too.

I just want my zoom entry in my calendar to be added to the one calendar, not all of them.

Can someone let me know what happened and how do I fix it please

Thanks