While working on creating additional Request Types for a Change Request Issue I noticed that I am missing a custom field called "MaintenanceStartTime" in my SLA section.

When I go to search for the custom field in the side bar, there are no results. Instead, what I have noticed is that the field is now present on the "Request Form" section. I am trying to determine what happened that caused the field to get added on that section as well as how to get it moved back to the "Issue View".
Currently when I view "Request Form" I do not have any options to move this field.

Any ideas would be greatly welcomed.