Having this resolved as soon as possible is our priority, @CH360. I'm here to guide you to aid this error encountered in the banking tab.
QuickBooks is dependent on the data the bank gives. We recommend contacting your financial institution to find out the purpose of the setup of suppliers without your consent.
I'm also sharing these articles that will help you reconcile your books in the future:
You can always visit the Community page for more assistance with your transactions and to check this further. Have a great day.
