Fragmentation Does Not Change

I am running this script to see the fragmentation of indexes.



SELECT a.database_id

,a.object_id

,a.index_id

,b.name

,a.avg_fragmentation_in_percent

FROM sys.dm_db_index_physical_stats (7,NULL, NULL, NULL, NULL) AS a

JOIN sys.indexes AS b

ON a.object_id = b.object_id

AND a.index_id = b.index_id

where a.database_id = db_id()

order by a.avg_fragmentation_in_percent desc



When I rebuild an index the fragmentation does not change 10% or lower (default index fill factor is 0, which I think is 90% fill)

SQL Server 2005 EE SP 2

Thanks,
~Joseph~