Excel row height changes when it should not change

I have a client using Office 2010 on a Citrix server. They are using Windows XP Pro SP3 for the desktop and the server is running Windows Server 2003 R2 STD.

I have two users working in a spreadsheet in Excel 2010. The spreadsheet opens fine and they can perform their updates by either adding manually or doing a cut and paste. The problem comes up when all of the sudden a number of rows in the spreadsheet change height for not reason. The spreadheet has the row height set to 14.5 but for some reason the rows that change height sent the height to 405.9. Usually all the user has to do is go back and reset the row height on these cells and save before they can go back to making changes.

It's more annoying then anything else so if someone could provide any solutions, it would be greatly apppreciated.

thanks, Joe Trainor