Unable to change default name on comments --Acrobat DC

In the last month, a few people in our department have had their default user name change to something other than their previously saved preferred names. One person had her name revert to a name she has not used for years, and another person has his last name now repeating on every comment. We have tried saving new default names, deselecting the "always use login name", and even uninstalling and reinstalling adobe. It seems to be an adobe glitch. Each time, it will change only for the one note, then revert back despite clicking "use as default" and saving. Does adobe have a fix for this? It is more than a simple annoyance. People need the ability to use their preferred names.