We also experienced a progress bar that didn't visually align with the survey. We added a statement on the final page of the survey that alerted our team members that advancing the survey would navigate them to the end of the survey.

The progress bar unfortunately takes into account all the blocks/branches, that's why it's mostly out of sync.
If you know the progress, you can set it manually on each page. Just add the code below in the JS of the question on a page and set the value of progressBarValue accordingly:
Qualtrics.SurveyEngine.addOnload(function () {
    const progressBarValue = "30%"; //change this to desired value
    document.querySelectorAll(".ProgressBarFill").forEach((item) => {
        item.style.width = progressBarValue;
    });
    document.querySelectorAll(".ProgressBarContainer td").forEach((item) => {
        const value = parseInt(item.innerText.replace("%", ""));
        if (value < 100) {
            item.innerText = progressBarValue;
        }
    });
});
Here's a demo for a more flexible solution: https://demo.survey-awesome.com/block-progress-bar