Confused by dba_tab_privs

I run the following query:

select * from dba_tab_privs
where grantee = 'PUBLIC'
and table_name like 'DBMS%'
order by owner, table_name

In the result I notice that there are a lot of duplicate records, e.g. dbms_job, dbms_transaction. ( 63 rows retrieved, 49 distinct rows). What could be causing this? Is it a reason for concern? Oracle 8.1.7.2.7 on W2K

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Terry Dykstra
Canadian Forest Oil Ltd.