Mysterio619: The rules do not say anything specific about this situation, so the rules of Czech Checkers will apply analogously. Since the rules of Czech Checkers do not allow an umpromoted piece to continue jumping after promotion, the situation in your game has to be considered a bug.
(hide) If you don't want other users to know what you are doing you can change into cloak mode in Settings (paying members only). (pauloaguia) (show all tips)