u/Cultural_Zombie2105

Recently i saw in Manage my devices that 4 other devices are using my account, but i am only using on one device since i bought the account, i do have account number saved as pic on mobile, i am wondering if some unknown person using my account will he able to get other devices information if bug report featured used and contact mullvad? Is there anything else i can do to change account number? Can they find payment information used to purchase the account using mullvad account dashboard?