I'm a beginner and I'm trying to make a popcat game parody. I have this simple code in JS for scoring points:

// touch event

img.addEventListener("touchstart", function(){

    increaseScore();
    img.src = 'popcat2.png';
    audio.play();
});

img.addEventListener("touchmove", function(){

    img.src = 'popcat1.png';
     audio.play();
});

But whenever I try to use this on my mobile it doubles the score: one for event touchstart and another for touchmove, instead of scoring one time. How can I fix this problem?