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                  <div id="click_box"></div>
<div id="popup_content"><p>I am a popup!</p>
  <div id="X"><p>X - close me</p></div>

<p><strong>Directions:</strong> Click the red box to show the popup. Then click the reset button to reset the timeline back to the start. Using code inspector, notice that the red box has 2 classes (hover & active) added to it when they shouldn't be added. Line 28 of JS code with the className code seems to be causing the issue.</p>
  <button id="reset_button">Click to reset</button>



                #click_box {
  cursor: pointer;

#popup_content {

#click_box.hover {background: black;}

#X {
  cursor: pointer;

#popup_content p {color: white; margin-left: 10px;}

body { background: white;}


                $("#click_box").click(function() {
	if ( !($(this).hasClass("active"))) {	

function addClick(target) {
	console.log("addClick running");

function removeClick(target) {
	console.log("removeClick running");

function addActive(target) {
	console.log("addActive running");

var click_popup = new TimelineMax({paused: true});	
    .call(removeClick, ["#click_box"])
    .call(addActive, ["#click_box"])
    // Determined that line 28 below is causing the class issue. *****************************
    .to($("#click_box"), .15, {className: "-=hover"})
    .from($("#popup_content"), .5, {display: "none", opacity:0})
    .to($("#popup_content"), .5, {display: "none", opacity:0})
    .call(addClick, ["#click_box"])
$("#X").click(function() {
	console.log("clicked X");;
$("#reset_button").click(function() {
  console.log("Resetting - remove classes and reset popup timeline back to 0");
   // Tried using greensock to manipulate the classes but the bug still occurred.
   //TweenMax.set($("#click_box"), {className: "-=hover"})
   //TweenMax.set($("#click_box"), {className: "-=active"})

$("#click_box").hover(over, out);

function over() {
	//console.log("hover over");
	if ( !($(this).hasClass("active"))) {$(this), .25, {className: "+=hover"})

function out() {
	//console.log("hover out");	
	if ( !($(this).hasClass("active"))) {$(this), .25, {className: "-=hover"})

Save your sass for CSS. Everywhere else be kind.