Profiles Being Overwritten and All Syncing to Single Profile

I have 2 different profiles in my home under 2 different email accounts. One for the kids, and one for myself.  With the new version and layout of NextDNS, these accounts suddenly began syncing across ALL devices on my lan.  Either I get the kids profile, or they get mine.  It's overrides each device to whatever was the latest profile code I use to login.  I've looked everywhere in settings for some means to try stop this account synchronization behaviour.  What am I missing?