Didsterfay

So, when i tried to log in a server i got this ban saying "BAD ACTIVITIES ON YOUR OTHER PC" but i dont have another pc, and i didnt do anything wrong like cheating, i really want to know why i got banned and if possible to get my ban removed. My serial is: 9DAE83D1B4F610CAB9D8C40073EDBCB2 Screenshot: https://prnt.sc/uU0cG0_adzef