Confusion on a meeting link

I went into “a meeting” link that was on my zoom this morning as the host and no attendees were there. I later received emails from two people who had signed up and said “we were in the meeting but it said the host was in another meeting”. I’m cofused as to what went wrong.  I don’t understand why they have a separate link.

This is a reacurring meeting and I want to correct this for the future.

Thanks for any help someone can provide.