dashlet scrollbars missing in 14.0.x

I have some very basic custom Dashlets that we've had since the intelligence pane was first introduced years ago.
Since upgrading from v11 -> v14.x we lost the scroll bars on the side/bottom of these dashlets.

Any suggestions on how to rewrite/correct these?

The dashlets are all similar, with a controller that calls an API (in Sugar or an external resource), takes the results and puts them in a very basic table:
controller:

({
  tagName: 'ul',
  className: 'dashlet-childContracts',
  plugins: ['Dashlet'],
  resources:{},
  initDashlet: function(view) {
    var self = this,
        index = 0,
        contract_number = this.model.get('contract_number'),
        url = app.api.buildURL('getChildContracts/'+contract_number);
    self.resources = new Object();
    app.api.call('GET', url, null, {
      success:function(data){
        self.total = data.length;
        _.each(data, function(value, key){
          self.resources[index] = {
            'contract_url':'index.php#wcont_WContracts/'+value['id'],
            'name':value['name'],
            'contract_number':value['contract_number'],
            'contract_status':value['contract_status'],
            'contract_type': value['contract_type'],
            'effective_date': value['effective_date'],
            'expiration_date': value['expiration_date'],
           };
           index++;
        });
        self.render();
      },
      error: function(e) {
        console.log(e);
      }
    });
  }
})

metadata:

<?php
$viewdefs['base']['view']['dashlet-childContracts'] = array(
    'dashlets' => array(
        array(
            'label' => 'LBL_CHILD_CONTRACTS_DASHLET',
            'description' => 'LBL_CHILD_CONTRACTS_DASHLET_DESC',
            'config' => array(),
            'preview' => array(),
            'filter' => array(
               'module' => array(
                  'wcont_WContracts',
               ),
               'view' => 'record',
            ),

        ),
    ),
);

hbs:

{{!--
 */ formats output `
--}}
<div class="flex-list-view-content">
    <table class="table table-striped dataTable">
      <tr>
      <th>Contract Num</th>
      <th>Effective Date</th>
      <th>Expiration Date</th>
      <th>Limited Coverage</th>
      <th>Contract Status</th>
      <th>Contract Type</th>
      </tr>
      <tbody>
      {{#each resources}}
        <tr>
              <td><a href="{{contract_url}}" target="_blank">{{str contract_number module}}</a> </td>
              <td>{{effective_date}}</td>
              <td>{{expiration_date}}</td>
              <td>{{contract_status}}</td>
              <td>{{contract_type}}</td>
        </tr>
      {{/each}}
      </tbody>
    </table>
</div>

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