Chartjs-Why am I getting NaN on one out of every string of numbers?

So it was my json, what I ended up doing was passing the full list of rounds to my javascript, then inside the thymeleaf loop I passed the roundId via the th:roundId.

html
inside the thymeleaf loop

<div class="container-fluid">
     <canvas th:roundId="${round.roundId}" th:id="myChart"></canvas>
</div>

passing the full list of rounds

<script th:inline="javascript">
    let rounds = /*[[${roundsJsonNode}]]*/ {};
</script>

then in the javascript I get the round by id using the getRoundsById method, and create a bar chart for each round.

function getRoundById(rounds, roundId) {
      return rounds.find((round) => round.roundId === Number(roundId));
    }

    

    const charts = document.querySelectorAll('[roundId]');
      charts.forEach(chart => {
        const getRound = chart.getAttribute('roundId').split(',');
        const roundData = getRoundById(rounds, getRound);

        const scoreCount = roundData.scores.length;
        const scoreData = {};

        for (let i = 0; i < scoreCount; i++) {
          const score = roundData.scores[i];
          if (!scoreData[score.name]) {
            scoreData[score.name] = {
              count: 0,
              color: score.color,
              score: score.score,
            };
          }
          scoreData[score.name].count += 1;
        }

        const datasets = [];
        Object.entries(scoreData).forEach(([name, data]) => {
          datasets.push({
            label: name,
            backgroundColor: data.color,
            data: [data.count],
            score: data.score, // add score value to dataset object
          });
        });

        datasets.sort((a, b) => a.score - b.score); // sort datasets by score value

        const myChart = new Chart(chart, {
          type: 'bar',
          options: {
            responsive: true,
            maintainAspectRatio: false,
            indexAxis: 'y',
            scales: {
              x: {
                stacked: true,
                display: false,
              },
              y: {
                stacked: true,
                display: false,
              },
            },
            plugins: {
              legend: {
                display: false,
              },
            },
          },
          data: {
            labels: [''],
            datasets,
          },
        });
      });