The difference may be the track announcer seeing who has left the pits & the referee being told what was happening. Things can sometimes change and the rider not getting the message quick enough.
No rain offs!!!! , knockout Cup, play offs, all has to be accounted for and planned into the fixture list. It's not just thrown together. Also time taken out for the local egg& spoon race or intentional bean bag throwing or whatever they do.
Concerns about large numbers of young adults attending in gangs. You should be so lucky. Small groups young adults will attend at best. The sport needs as many as possible to attend so stop trying to put them off.