Mail going to wrong mailbox
I use Gmail thru the Apple Mail system. I have an inbox and numerous sub mailboxes. I have set up rules on a number of them. I am finding an unusual amount of mail (both incoming and outgoing) going to a sub mailbox I call "Taxes". I have reviewed each Rule under preferences and can find no rule that ever uses Taxes. How can I stop mail from going there and yet still retain the mailbox so that I can store related Taxes messages there?
iMac 27″, macOS 12.1