Count Of Occurrence In Given Period Of Time - Query Has Unexpected Results

I need to query the count of an occurrence in a given period of time, so I created this query. But it does not give me any results.

SELECT TOP 1000
o.[ID]
,o.[TimeOfOrder]
,x.[StreeLine1]
FROM [SC].[dbo].[bvc_Order] o
FULL JOIN SC.dbo.xmlAddressRead x
ON o.ID= x.id
WHERE DATEDIFF(HOUR,o.[TimeOfOrder],(DATEADD(Hour, -48, GETDATE()))) < 48
GROUP BY x.[StreeLine1], o.ID, o.TimeOfOrder
HAVING COUNT(x.[StreeLine1])>1

Then I change the query slightly and I ask it to show me the ones that are going to '599 Ships Landing Way' and it gives me 356 results! The Query doesn't crash, but it doesn't give me the results I need. What did I do incorrectly?

SELECT TOP 1000
o.[ID]
,o.[TimeOfOrder]
,x.[StreeLine1]
FROM [SC].[dbo].[bvc_Order] o
FULL JOIN SC.dbo.xmlAddressRead x
ON o.ID= x.id
WHERE DATEDIFF(HOUR,o.[TimeOfOrder],(DATEADD(Hour, -48, GETDATE()))) < 48
AND x.[StreeLine1]='599 Ships Landing Way'

I use Microsoft SQL 2008