Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello Randall Prince
Being connected to the same network should not cause two separate Microsoft accounts or OneDrive storage locations to mix.
On each computer, please select the OneDrive cloud icon in the taskbar, open Help & Settings > Settings > Account, and confirm that only the correct Microsoft account is listed. If the other person’s account appears, select Unlink this PC, then sign back in using the correct account.
Also open Word or Excel and check File > Account to make sure Office is signed in with the same account used by OneDrive. Remove any account belonging to the other person.
Before deleting or moving any files, verify which account owns them through OneDrive on the web, since deleting files from a synced folder may also delete them from the associated cloud storage.
I hope this helps you identify where the accounts are becoming linked.
Feel free reply back to this post if you need further assistance, I'll be happy to help.