What do you mean that castling wasn't programmed correctly?
DisguisedToast vs. Hafu
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Oh wow! I have never heard of the software making an error like that before. Pretty strange.
I understand what you mean now. On move 21 (which is not shown) white was allowed to castle out of the checkmate.
This is the game Toast and Hafu played in the game It Takes Two. What do you think?