When opening a Boostrap Modal Window (or switching Boostrap Panels) and you scrolled the content previously, it will retain the position. Here are two methods to scroll the content back to the top after opening the modal again.

There was change in boostrap where you need to use: on shown.bs.modal or use a function call.

<div id="HelpScreenModal" class="modal fade" role="dialog">
    <div id="HelpDialog" class="modal-dialog">
        <!-- Modal content-->
        <div class="modal-content">
            <div class="modal-header">
                <button type="button" class="close" data-dismiss="modal">×</button>
                <h4 id="HelpScreenModalTitle" class="modal-title"></h4>
            </div>
            <div id="HelpScreenModalContent" class="modal-body">
            </div>
            <div class="modal-footer">
                <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
            </div>
        </div>
    </div>
</div>

//call a function when you show the modal window (I opted for this method)
<button onclick="showSMSSummary(); return false;" data-toggle="tooltip" title="Click To iew Summary" class="btn btn-primary btn-sm">SMS Summary</button>

function showSMSSummary()
{    
     $('#HelpScreenModal').modal('show');            
     $('#HelpScreenModalContent').animate({ scrollTop: 0 }, 'fast');
 }