MS Access Reports page setup reverts

I am using MS Access 2000 and have set up various reports in the database. For some reason the page setup on these reports keep reverting to default. An example of one would be:- Orientation=Landscape; T,L,B,R margins = 10. Each week when I print this report it has reverted back to:- Orientation=Potrait; T,L,B,R margins = 24.99 so I have to setup the page each time I print the reports. Any ideas?