Bootstrap accordion icons not working on collapsed states - twitter-bootstrap-3

Question

I am working on a accordion in Bootstrap V 3.37. I have icons on the accordion which change with open and closed states. When I the state set to collapse init works fine. But when I have the accordion with none of them accordions collapsed in the icons are not working properly.
The icons should be working as:
Arrow facing down on closed state
Arrow facing up on open state
My code is as follows so far:
HTML Structure
<!-- Panel list accordion -->
<div class="panel-group">
<div class="panel-heading-one panel-main-heading-one">
<h4 class="panel-title panel-main-title">
<a class="accordion-toggle" data-toggle="collapse" data-parent="#accordion" href="#collapseTwo">
<img src="../images/image.svg" class="panel-icon">
<p>Title here</p>
</a>
</h4>
</div>
<div id="collapseTwo" class="panel-collapse collapse">
<div class="panel-body panel-bodymain-one">
<p>Text body here</p>
</div>
</div>
<div class="panel-heading-one panel-main-heading-one">
<h4 class="panel-title panel-main-title">
<a class="accordion-toggle" data-toggle="collapse" data-parent="#accordion" href="#collapseThree">
<img src="../images/image.svg" class="panel-icon">
<p>Title here</p>
</a>
</h4>
</div>
<div id="collapseThree" class="panel-collapse collapse">
<div class="panel-body panel-bodymain-one">
<p>Title body here</p>
</div>
</div>
<div class="panel-heading-one panel-main-heading-one">
<h4 class="panel-title panel-main-title">
<a class="accordion-toggle" data-toggle="collapse" data-parent="#accordion" href="#collapseThree">
<img src="../images/image.svg" class="panel-icon">
<p>Title here</p>
</a>
</h4>
</div>
<div id="collapseThree" class="panel-collapse collapse">
<div class="panel-body panel-bodymain-one">
<p>Text body here</p>
</div>
</div>
</div>
</div>
<!-- End panel list accordion -->
CSS
.panel-heading-one .accordion-toggle:after {
/* symbol for "opening" panels */
font-family: 'Glyphicons Halflings';
content: "\e113";
float: right;
color: #ffffff;
height: 24px;
width: 40px;
background-color: #000000;
}
.panel-heading-one .accordion-toggle.collapsed:after {
/* symbol for "collapsed" panels */
content: "\e114";
}
Screenshots attached also.
Closed state - still point up:
Open state is fine as it points up:
Any help would be great.

Answer 1

Change your css to:
.panel-heading-one .accordion-toggle:after{
font-family: 'Glyphicons Halflings';
content: "\e114";
float: right;
color: #ffffff;
height: 24px;
width: 40px;
background-color: #000000;
}
.panel-heading-one .accordion-toggle[aria-expanded="true"]:after {
/* symbol for "opening" panels */
content: "\e113";
}
.panel-heading-one .accordion-toggle[aria-expanded="false"]:after {
/* symbol for "collapsed" panels */
content: "\e114";
}
And it will work perfectly.
Extra: In your accordion you have used same href='#collapseThree'
for last and second last item. When you will click on last element, it
will open second last item. So change your href in last element.