Print Error

I have a problem with crystal reports print.I want to print in a preformatted bill, in which there are some rows in details part and a total at the right hand bottom.What happens is that when there is only one row in the details part it prints the total at the correct location.If there are more rows in details part the total goes down accordingly.Such that if there is some 7 rows in the details part the total prints by almost middle of the next bill.Can anyone advise me how to do that.Thanks in advance