I just noticed a small bug on the site:
When I capture a pawn en passant, and check the move to next game box, the en passant move doesnt get registered. However if I uncheck the box, the move registers.
I don't know whether this happens all the time, but it happened to me that one time. It's a very minor problem, and I don't care if it doesn't get fixed- just bringing it to your notice!