Is it truncated to 65535 (or 65536) characters? This might help you.
Just set Maximum Characters Retrieved
Tools > Options > Query Results > SQL Server > Results to Grid > Maximum Characters Retrieved
Or you can find more information here.
How can I visualize the value of nvarchar(max), with max>65535, from SQL Server database? [duplicate]
How do you view ALL text from an ntext or nvarchar(max) in SSMS?