My quiz has a bug in where if the correct answer is pressed multiple times, the score increases an infinite number of times?

https://stackoverflow.com/questions/76227565/my-quiz-has-a-bug-in-where-if-the-correct-answer-is-pressed-multiple-times-the

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<!-- Multiple Choice Page -->

<div class="page-multiple-choice">
    <div id="beginning-screen-quiz">
        <h1 id="heading-quiz">Oh no! it looks like you have been locked out of the computer system. You will have to
            take this quiz in order to regain access, you must get a score of 60 in order to bypass the security system.
        </h1>
        <button id="start-button-quiz">Hack into security</button>
    </div>
    <h1>Multiple Choice Quiz</h1>
    <div class="p2-button button">
        Fix the circuit
    </div>
    <div class="p-menu-button button">
        Go back to menu
    </div>
    <div id="wrapper">
        <div id="question">Sample question here</div>
        <div id="answersAndFeedback">
            <div id="answer1" class="answer-box">Answer 1</div>
            <div id="answer2" class="answer-box">Answer 2</div>
            <div id="answer3" class="answer-box">Answer 3</div>
            <div id="feedback" class="hidden">Feedback goes here</div>
        </div>
        <div class="score">0</div>
        <div id="next-btn" class="hidden">next</div>
        <div id="game-over" class="hidden">Congratulations! Continue to the next page!</div>
    </div>
</div>

JavaScript

// --------------------------- Multiple Choice Page functions and variables -------------------------------------

    // Study Page

    var currentBox = 1;
    var numBoxes = $('.text-box').length;

    // variables here

    var quizData = [
        {
            question: "If the size of a battery in a complete circuit is increased:",
            answers: ["the current decreases", "the current increases", "the voltage stays the same"],
            correctAnswer: 2,
            feedback: "An increase in voltage will increase the current flowing in a circuit (if nothing else is changed) Click to next page find out more."
        },
        {
            question: "The current in a series circuit containing two bulbs:",
            answers: ["is the same at every place in the circuit", "is larger nearer the battery", "is larger between the bulbs"],
            correctAnswer: 1,
            feedback: "This is an important point to remember about a series circuit. Click to next page find out more."
        },
        {
            question: "Two identical bulbs are in parallel in a complete circuit. If one breaks:",
            answers: ["the other stays on", "the other goes off", "the other bulb is brighter"],
            correctAnswer: 1,
            feedback: "This is a benefit of a parallel circuit, it is usually easier to find out which component has broken as the rest still work"
        },
        {
            question: "Wires are usually coated in plastic because:",
            answers: ["plastic is an insulator", "plastic can be lots of different colours", "plastic helps the wires conduct electricity"],
            correctAnswer: 1,
            feedback: "Wires used to be covered with rubber as an insulator but rubber perishes faster than plastic."
        },
        {
            question: "Which of the following statements is true?",
            answers: ["A voltmeter is connected in series to measure voltage.", "Different sized bulbs in parallel have...