It's a new handicapping process. You're so lucky to be chosen by the site to try this out. (kidding!)
Gosh, that's a strange glitch. Is your mouse (or the vastly superior method, 'trackman' usage) 'sticking'?
Which game was involved and which squares?
sftac
editted to add: Sayyyy, I don't suppose those four squares had anything to do with your trying to Castle improperly, hmm?
I was just on live chess and pieces wouldn't move for me on about 4 of my squares. Hard to play like that! :)