[URGENT!!] I have Facing Problem With SUM in Crystal Report in Visual Studio 2005!!

Question

Hi, I need Help~!

I have 1 Database Group By a Field (Room_Type) and I want to SUM the (No_Of_Room_Reserve) in the Crystal Report by using right click -> insert -> Summary -> SUM...I have the Values with 1, 1, 3 and suppose get the values with 5 BUT it result me as 3 with similar like COUNT. Anyone can help me solve this problem?? Because I have due to deadline..thanks alots!

Henry~