Pass Input Parameter With Blank To SSIS Get Strange Result

Hi! I stuck for a while when executing SSIS from stored procedure with input parameter. My input value is not consistent with output one. If I pass value with blank , SSIS seems gets second part. For example , if I pass "CALL FROM SP", SSIS get"FROM" only. 

I use Execute SQL Task to store input parameter. Here is the SSIS snapshot.

And here is the sp snippet

DECLARE @Path VARCHAR(200),
@Cmd VARCHAR(4000),
@ReturnCode INT,
@QUERY_STRING VARCHAR(70),
@BATCH_NO VARCHAR(14)

SELECT @Path = 'xxxxxx'
SELECT @QUERY_STRING = 'CALL FROM SP'
--BatchNo = YYYYMMDDHHMMSS
SELECT @BATCH_NO = CONVERT(VARCHAR(10),GETDATE(),112) + REPLACE(CONVERT(VARCHAR(8),GETDATE(),108),':','') 


SELECT @Cmd = 'DTexec /FILE "' + @Path + 'Package1.dtsx" /MAXCONCURRENT 1 /CHECKPOINTING OFF /REPORTING EW ' + '/Decrypt ALCM '+ ' /SET \Package.Variables[User::BATCH_NO].Properties[Value];' + @BATCH_NO + ' /SET \Package.Variables[User::QUERY_STRING].Properties[Value];' + @QUERY_STRING

My test are

Anyone could give me some hint ? 

Thank you so much!!