Your general modal has invalid closing tags in its composition.
Can you try this?
<div id="shareModal" class="modal fade" role="dialog">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal">×</button>
<div class="row">
<div class="col-sm-2"> <img class="" src="images/poster-image - Modal.jpg"/> </div>
<div class="col-sm-10"> <h4 class="modal-title txt-highlighted">Share this post</h4> </div>
</div>
</div>
<div class="modal-body">
<div class="row">
<div class="col-sm-9">Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry standard dummy text ever since the 1500s, when an unknown
printer took a galley of type and scrambled it to make a type specimen book.
</div>
<div class="col-sm-3 " style="padding-left:7%;"><span class="img-product-modal-frame"><img src="images/img-product.jpg"/> </span>
</div>
</div>
</div>
<div class="modal-footer">
<div class="row">
<div class="col-sm-10">
<div class="col-sm-2 text-left no-padd-left">
Share on my
</div>
<div class="col-sm-2">
<div class="checkbox-inline">
<input type="checkbox" class="modal-checkbox "/><img src="images/fb-grey.gif"/>
</div>
</div>
<div class="col-sm-2">
<div class="checkbox-inline">
<input type="checkbox"/> <img src="images/twitter-grey.gif"/>
</div>
</div>
<div class="col-sm-2">
<div class="checkbox-inline">
<input type="checkbox"/> <img src="images/linkedin-grey.gif"/>
</div>
</div>
</div>
<div class="col-sm-2"><button type="button" class="btn btn-default" data-dismiss="modal">Share</button> </div>
</div>
</div>
</div>
</div>
</div>
instead of the original fashion?
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