Why do Spoken Move Announcements for Piece Movement occasionally run into each other?

When playing a game where Piece Movement is set to Spoken Move Announcements in the Chessmaster Sounds Options window, the voice-overs that accompany piece movement occasionally run into each other. This occurs only when two moves are made in quick succession, as there is not time to complete the first voice-over before the second voice-over begins. For example, if you play a move and your opponent makes one directly afterwards, Chessmaster will not have enough time to play both voice-overs and so will cut out the voice-over for your move; otherwise the Spoken Move Announcements would not be synchronised with the moves being made on screen.