AR date changed in deposit slip

We are using Timeslips 2012.  Within the last two months this same problem has come up and we can't figure out why.  When our AR payments are entered on one deposit slip, they are all entered using the date of the deposit.  However, after the deposit slip is printed the dates of the payments are all changed. This last instance they all change from 9/17/2014 to 9/3/2014.  The previous time some of them had completely different dates.  We have checked the system date and the bill date and they are both correct.  Any ideas why this would be happening?  Is there a setting that changes the date for some reason?