This is actually happening with a different host's account, but I'm trying to help them.
The host relisted a listing that had been unlisted for months, and then began updating various details and parameters in the listing. In very short time, the calendar for that listing suddenly showed a "Jasime Gordley" blocking the calendar for the next couple months starting tomorrow. No inquiry or booking request shows up in the host's inbox. The name cannot be clicked on in the calendar and the calendar cannot be altered because it is blocked.
This random name just showed up and perma-blocked part of the calendar without explanation.
Any ideas?
The only idea I had was that this person is a spammer and they made a booking request and then had their account shut down.