I can't castle in chess 960

My king is in original position, in c1. My rook is in original position, in h1. g1, f1, e1 and d1 are empty. No check. Why can't I move my king to g1 to castling?

How is castling entered in lichess960?

Just drag your king onto the rook. See here: lichess.org/variant/chess960

Maybe because there was an attack on the g1 or f1 or e1 or d1 square.
Can you please send the link of the game? @Francesc_Vicent