When you are on the main page for a unit (https://www.scoutbook.com/mobile/dashboard/admin/unit.asp?UnitID=xxx), the top left shows a count of leaders and Scouts.
The leader count is incorrect. It is not the number of leaders. Rather, it is the number of leaders who have set up their Scoutbook accounts.
For example, this is what I see for Crew 863 in Circle Ten Council (unit ID 115035 in Scoutbook):
If you then click on Crew Roster, you see the correct leader number at the header of the leaders column:
I also have access to a troop and pack, and they all share the same problem.