Hello Kristin,
What you are describing is very unusual behaviour. If you look at he Sample Data that ships with Adagio, do you see the Optional Fields that were defined for those modules ? If so, it would mean that they have remained on your system for an extended period of time without defaulting back to blank.
The only things that I could think of would cause the fields to "default back to blank" would be:
1. if your data had been restored - but this should have far worse implications as all data subsequent to the restore point would disappear as well, or
2. if someone else went back into the Company Profile and removed the entries you had made. Do you use security on this company ? if not, maybe you should and prevent others from accessing the Company Profile and other setup/configuration areas as well.
Pete