Getting extra employees in BI report those are not direct or indirect reports of logged in manager

Summary:

Created BIP report to get direct indirect reports of manager however we are getting few extra employee those are not direct or indirect of logged in user (line manager) ..see below query. If anyone can help to resolve this issue by tweak in below code

Content (required):

SELECT distinct

 (

 SELECT person_number

 FROM fusion.per_all_people_f

 WHERE person_id = a.person_id

 AND TRUNC(sysdate) BETWEEN effective_Start_date AND effective_end_Date

 )

 Person_number 

FROM fusion.per_manager_hrchy_dn a

WHERE TRUNC(sysdate) BETWEEN a.effective_Start_date AND a.effective_end_Date

start with (manager_id in (select person_id