The Admissions and Leavers report displays the Contact 1 address of the student, not the address on the front of the student profile. To check the contact has an address listed please go to the student profile (search the name of the student in the top right hand search bar), click onto contact 1, then click onto the black cog to check an address is present here. Also check that the Contact is set as Active, because if they are mistakenly marked as Inactive the address will not appear in the report.