Staffa - 12:19 pm on Apr 16, 2012 (gmt 0)
"question what do they want?"
they probably don't know themselves
I see the same happening on one of my sites and just ignore it. Once in a while I clean out the registrations and delete all the non-actives (some register (humans) and don't even bother to activate their account).
Since they love to register so much, they can do it again next time they want access ;o)