Although counterintuitive it is possible to go down on the waitlist, from number 4 to number 5 for example. This usually happens when another application is updated with a similar or higher priority number. For example, if a family forgot to include a sibling in their child’s application, and then edited their application, they would likely move up on the waitlist because of the higher priority they now have.
Additionally, at the end of the on-time application widow, we start to include late applications. On-time applications that have the same priority group as a late application (for example, if both were in the neighborhood group), will be ranked ahead of late applications. If, however, a late application has a higher priority than the on-time app (for example, the late application has sibling priority and the on-time application neighborhood), the late application would be placed above the on-time one.