Dropping riders on a no drop group ride

Today we had a group ride with 13 riders, 2 of the riders were dropped. I thought that was not possible during a no drop ride.

Was this a meetup with “keep everyone together” enabled or a group ride event?

If a meetup, when someone stops pedaling for too long they are dropped.

If a group ride, there is nothing stopping people from being dropped, there is no such thing as a “no drop” ride in zwift unfortunately. Some group ride leaders are very good and stay within the advertised w/kg and others are not so precise.

Thank you for your quick response.
This was a meetup with “keep everyone together” enabled
After talking with the ones that were dropped I found out that they had
indeed quit pedaling so problem solved.
Thank you again