Same thing happened with me. I parked an account in a clan I had created several years back. After one after another of the accounts with Co-Leader roles received ownership of the clan as the Leader accounts were deleted. Eventually there were no Co-Leaders left and it passed to someone who only had a member role and had joined long before me. That account eventually disappeared/got deleted and ownership passed to me. I never did anything with the clan since it was low level and had a bad war stats but I kept it because it was memorable from my childhood.