Odd... when reading the ban history, it shows only Sinnikin's ban from a while ago...
I will do a little research in my own screenshot file to see if anything pops up...
Hmmm... seeing as though I was unable to find anything related to grief by you, you should be able to log back in to the server. I don't even remember banning you for grief, but I do remember the ruckus you caused in the server chat the other day.
Make sure you don't cause any more trouble, mkay?