Love Sex

I was buying a series of names a few days ago and missed 1. I only used 1 domain registrar to search for the domains and all were available because these names are obscure.

So i go to register the name and it was baught today by domibot.com which I hold suspect because it uses an automated process. Taken from the site "Domibot registers expiring and previously registered domains using an automated process. No humans are involved in selecting domains"
The name to the best of my knowledge was never previously owned and i cant see who would want it anyway.

How can they do this?