Objects with Stale Statistics

I have about 120 objects with stale statistics. But my gather_statistics_job (weekday maintenance window) is not taking care of the same. What could be the possible resons. (the stats for none of the table are locked.)

SQL>
SQL> select count(1) from dba_tab_statistics where STALE_STATS = 'YES' and owner='&USER';

  COUNT(1)
----------
       118

SQL>
SQL>
SQL>
SQL> select count(1) from dba_tables where trunc(last_analyzed) >= sysdate-1;

  COUNT(1)
----------
         0

SQL>