Castling Bug?!?

I need some help with my game id: 85977. I want to make a castle
(the best move possible) but I'm not allowed to. The thing is that I
know that I'm allowed to make this move. I never moved my king or
my tower, my king is not check, and it won't be if i make the castle.
So this is a major bug! Is this happened to somebody else? Or maybe
I missed something....

Yan

but you had already moved your king to take the white bishop........

LOL! Yes it's true.... I've just forgot this move! Thank you GrayKnight
for wake me up!

Yan