Most likely what happened is someone got the card information and is changing their card to that.
Right - but from where? understand - this card has NEVER been used by me. It was in the envelope, then in my safe. I never used it in person or online. Never took it out of the house. In fact, for as long as my wife has had that account (like 20+ years) I have NEVER bought anything on that card.
Maybe CC companies should send cards in RFID envelopes.