If the console is running oki, then just leave it.
If you have issues with the Accounts on the Console, delete them and reinstall them again.
PS Plus can save the game date/progress to the cloud, at least the one with the Plus Subscription.
So you won't lose that data. You would probably have to save the data for the Accounts that are not covered by Plus onto a memory stick.
Not sure of the exact problem you have, Accounts don't change like that, they are associated with unique email addresses. So, they cannot change like that.