//contact form
<div id="contact_us">
<div id="contact_form">
//hubspot form has to be displayed here
</div>
</div>
<!-- Hubspot Form -->
<!--[if lte IE 8]>
<script charset="utf-8" type="text/javascript" src="https://js.hsforms.net/forms/v2.js"></script>
<![endif]-->
//contact form
<div id="contact_us">
<div id="contact_form">
//hubspot form has to be displayed here
</div>
</div>
<!-- Hubspot Form -->
<!--[if lte IE 8]>
<script charset="utf-8" type="text/javascript" src="https://js.hsforms.net/forms/v2.js"></script>
<![endif]-->
yes, that's the problem as seen in your first screenshot the js src which supposed to be ref to HubSpot CDN was reference to your parent directory/root