Can anyone help me out... for some reason my denon keeps reverting to previous settings.

for example, When I first set up the denon I ran the subwoofer higher and the SW level was set to -10db on the receiver.

I have changed this so that it needs to be -2.5 db on the receiver now...

However, half the time I check it is backl at -10db, no matter how many times I change it back.

Any ideas?

-David