It's generated with your paper wallet generator. I have the wallet open here in the cli wallet and it definitely is a mimi address. I got stats from the pool with that address and had a stack pending for days. Don't know why a space got added when pasting here.

Testing: NsereBjTZGc3ua3KAEjvYaSAmZtx4fKJeSbnkwZZevNo5ooGywxkZLJVLjqaUgkuiX4HYsWisnhcaKb hjGR6zL7REoNxWZjEZWv

EDIT: Yeah the space definitely gets added here on bitcointalk. Pasted from miner config to https://www.charactercountonline.com/ -> no space.