What is the admin gateway in Membership Pro? Was our site hacked?

Hey there, my client at jesikafleming.com was looking at their newly subscribed members today and asked where a particular one came from... See attached screengrab.

What is the "admin" payment gateway? If they've hooked up their Paypal info, that's where it would normally say that they had paypal hooked up...

This isn't someone who we added as a user, new site accounts are set to subscriber in the general site settings... What is this we're looking at? Clients are concerned that they may have been hacked... is that the case?

Thanks much,
steph