Variable not changing button state

I've got a pretty complicated situation.

I am creating a compliance course that a user must be in each module for 30 minutes. There are 9 modules.

When the course begins, they can't leave the course, open another browser tab, click on a different monitor screen, etc.

Also, if they do any of these, their time stops and resumes when they return to the course and a popup layer tells them that they need to resume and that their time has stopped.

Everything works great except that I've got a variable, %correctedElapsedTime%, that shows the actual time that they've been in the course. Essentially, it subtracts the time away from the built in %Project.ElapsedTime% and shows a running timer in the corner of the slide the whole time.

I want a button to change states to normal when %correctedElapsedTime% has been met. Right now, I can only get the button to change when it is triggered by %Project.ElapsedTime%. 

%correctedElapsedTime% is a text variable with a value of MM:SS and %Project.ElapsedTime% is a number variable with a value of 0. I think this is where the problem may be. It also may be that my timer is somehow skipping over the 18000000 ms to meet the 30 min time constraint. Any thoughts?

Slide triggers

Master slide javascript and triggers

Javascript

var player = GetPlayer();
var elapsedTime = 0; 
var timer = null;
var isTabActive = true;
var isFocused = true;
var inactivityTime = 0; 
var inactivityLimit = 120; 
var inactivityTimer = null; 

// Load saved elapsed time
if (player.GetVar("correctedElapsedTime")) {
    var savedTime = player.GetVar("correctedElapsedTime").split(":");
    elapsedTime = parseInt(savedTime[0]) * 60 + parseInt(savedTime[1]); 
}

// Update elapsed time
function updateElapsedTime() {
    if (isTabActive && isFocused) { 
        elapsedTime++;
        var minutes = Math.floor(elapsedTime / 60);
        var seconds = elapsedTime % 60;
        var formattedTime = minutes + ":" + (seconds < 10 ? "0" : "") + seconds;
        player.SetVar("correctedElapsedTime", formattedTime);
    }
}

// Start elapsed time counter
function startTimer() {
    if (timer === null) { 
        timer = setInterval(updateElapsedTime, 1000);
    }
}

// Stop elapsed time counter
function stopTimer() {
    if (timer !== null) {
        clearInterval(timer);
        timer = null;
    }
}

// **Inactivity Timer Functions**
function resetInactivityTimer() {
    inactivityTime = 0; // Reset inactivity timer
    player.SetVar("showPopUpLayer", false); // Hide pop-up if user is active
}

function trackInactivity() {
    inactivityTime++; 
    if (inactivityTime >= inactivityLimit) { 
        player.SetVar("showPopUpLayer", true); 
        stopTimer(); 
    }
}

// **Event Listeners to Reset Inactivity Timer**
document.addEventListener("mousemove", resetInactivityTimer);
document.addEventListener("keydown", resetInactivityTimer);
document.addEventListener("touchstart", resetInactivityTimer);

// **Start inactivity tracker**
function startInactivityTimer() {
    if (inactivityTimer === null) {
        inactivityTimer = setInterval(trackInactivity, 1000);
    }
}

// **Detect window focus loss**
window.addEventListener("blur", function() {
    isFocused = false;
    player.SetVar("isFocused", false);
    player.SetVar("showPopUpLayer", true); // Show pop-up when window is blurred
    stopTimer();
});

// **Detect window focus gain**
window.addEventListener("focus", function() {
    isFocused = true;
    player.SetVar("isFocused", true);
    player.SetVar("showPopUpLayer", false);
    startTimer();
});

// **Detect when tab visibility changes**
document.addEventListener("visibilitychange", function() {
    if (document.hidden) {
        isTabActive = false;
        player.SetVar("isTabActive", false);
        setTimeout(function() {
            player.SetVar("showPopUpLayer", true); // Ensure pop-up layer appears
        }, 500); // Delay helps trigger the layer reliably
        stopTimer();
    } else {
        isTabActive = true;
        player.SetVar("isTabActive", true);
        player.SetVar("showPopUpLayer", false);
        startTimer();
    }
});

// **Start timers**
startTimer();
startInactivityTimer();