I don't know what to tell you on this because DT Register doesn't do this. There are no default config settings that are stored anywhere even. It only stores what you have in place, so there is nothing in the database to revert back to.
The only code that exists at all in this regard is in the install file that will establish default config settings ON INSTALL for any that do NOT ALREADY exist.
We have ZERO reports of this happening from anyone else and I honestly have no idea why this would happen. DT Register itself has no code or design to do any such act.