SQL Server CONTAINS and parentheses usage with wildcards

We have a SQL query that returns different results depending on whether the query terms are in parentheses or not and we cannot figure out why this is the case - see below 

SELECT*FROM dbo.TABLE_X WHERE(CONTAINS(DOCUMENT_NAME,'"(rev* rec*)"'))

- returns 4 rows

SELECT*FROM dbo.TABLE_X WHERE(CONTAINS(DOCUMENT_NAME,'"rev* rec*"'))

- returns 14 rows

So why do the parens in the first CONTAINS negate the wildcards?  Is this a SQL bug or am I missing something here.  If missing something, please help us understand what is going on here.

Thanks,