Why can I not castle

Black move 13 of the following atomic game.

Computer analysis let’s me castle queenside move 11 or 12 if I wanted, but not move 13

lol so funny rules xD

vanished into thin air, like Annihilated ot Teleport xD

maybe casteling means king annihilation and game lost? I saw them disseapearing oif they re interacting or near them, and while casling king touches the rook

Probably your opponent bribed lichess of not letting you castle so he could win the game

This looks like a rare case where it actually is a bug, unless there's some obscure atomic rule I don't know about (which is possible--I don't play much atomic). If you go to the position after 12...Qa1 and click on the "Share & export" tab, you will see in the FEN that Black has kingside and queenside castling rights. However, after 13. Qxa1, you can see that Black's castling rights (apparently incorrectly) get removed.

Also, if you go to the position after 12...Qa1 and go to an analysis board via the board editor and then make White's move 13. Qxa1, the analysis board does allow 13...O-O-O.

Also, if you open the PGN in XBoard, it does allow you to play 13...O-O-O.