Why does a TOAD with DBA module show different grants than a TOAD without the DBA module? (4283872)

User has two workstations running in  TOAD, but one has the DBA module and the other does not. When accessing the Grants  -tab for tables as user System, the two TOADs show different grants. Why?

A SQL Monitor session or Spool SQL shows the following queries being ran.

NON-DBA Module TOAD

Select PRIVILEGE, GRANTEE, GRANTABLE, GRANTOR
from sys.all_tab_privs
where table_name = 'EMPLOYEES'
and table_schema='JLIN'
order by grantee  

DBA MODULE TOAD

Select PRIVILEGE, GRANTEE, GRANTABLE, GRANTOR
from sys.dba_tab_privs
where table_name = 'EMPLOYEES'
and owner='JLIN'
order by grantee

if you look closely, one query pulls from the all_tab_privs table and one pulls from the dba_tab_privs table. Why?