Why do some Events show how many spots are left and others do not?

When an Event is published and visible to customers, customers will have an additional icon on the right side of the page. The PodPlay system will show the number of spots left in an Event when there are <10 spots left. If an Event has more than 10 spots left, it will not show how many spots are left.

The Events with <10 spots left have a blue tag to notify the customer. The Events with >10 spots left do not have a blue tag.