WSG192 Table Tennis Game Points

Hi there! My WSG192 is up and running mostly beautifully - my curiosity is that it doesn’t accurately record points, though. Many times when my husband was kicking my butt, it wouldn’t document his points, and vice versa. Eventually it would get there and declare him the winner, but still. Any thoughts on why this would be? Is this a problem with my soldering or a component, or a known glitch?