SSRS - ReportServer..ExecutionLogStorage

When running the below query to look at the size of the clustered index in my ReportServer database I see 2 rows?

select object_name([object_id]) as [table], page_count, record_count,
avg_record_size_in_bytes, (page_count * 8192) as size
from sys.dm_db_index_physical_stats(db_id(),null,null,null,'sampled')
where index_id = 1
and OBJECT_NAME([object_id]) = 'ExecutionLogStorage'
order by 4 desc

ExecutionLogStorage    31507    263300    897.965    258105344
ExecutionLogStorage    9791    460422    162.418    80207872

Why would this return 2 rows?

select *
from sys.sysobjects
where name = 'ExecutionLogStorage'

This query only returns one row.

Thanks

Adam