Scheduled meeting is messed up

I scheduled two meetings (review sessions) with my class, both were set to record. My camera light was on for both and I checked on the first one that it was indeed recording to the cloud. Each meeting lasted about an hour.

I now have a variety of recordings, but all of them are under a minute long. They all just include a single student (who were not sharing video). Also, I keep seeing that individual students join the meeting long after it is over, stick around for a few seconds and then leave. Then I get a notification that there is a recording ready.

I do not understand what is going wrong. I just want to share the recorded review sessions with my students.