There is no bug in the rules. Czech Checkers is just a variant played in our country and the rules details had been consulted with top Czech Checkers players.
From Checkers rules:
"If the player has more possibilities to capture opponent's pieces, he/she can select any of them. However, when a king or queen (in variants) can make a jump, the player cannot select a pawn to jump with."
(nascondi) Sei stanco di disporre le barche o i personaggi in Espionage all'inizio del gioco? Puoi andare all’editor del gioco e memorizzare, per uso futuro, alcune delle tue posizioni favorite. (pauloaguia) (mostra tutti i suggerimenti)