Modal Form tidak muncul di sebagian PC User/Client, apa yang harus ku lakukan ya??

sedangkan ketika proses development d pc sendiri normal, dan di beberapa client yang lain pun normal..

<div class="modal fade" id="addPeriod" tabindex="-1" role="dialog">

            <div class="modal-dialog modal-md" role="dialog">

                <div class="modal-content">

                    <div class="modal-header bg-danger">

                        <h4 class="title text-white" id="formModalLabel">PERIODE</h4>

                    </div>

                    <div class="modal-body">

                        <div class="table-responsive">

                            <table class="table table-striped js-basic-global dataTable">

                                <thead>

                                    <th>#</th>
                                    <th>Tanggal Awal</th>
                                    <th>Tanggal Akhir</th>
                                    <th>Action</th>

                                </thead>

                                <tbody>

                                {% for p in period %}
                                    <tr class="text-center">
                                        <td>{{p.id}}</td>
                                        <td>{{p.start|date:'d/m/Y'}}</td>
                                        <td>{{p.end|date:'d/m/Y'}}</td>
                                        <td><button data-dismiss="modal" class="btn btn-primary" type="button" onclick="selectPeriode('{{p.id}}','{{p.end|date:'Ymd'}}');"> pilih </button></td>
                                    </tr>
                                {% endfor %}

                                </tbody>

                            </table>

                        </div>

                    </div>


                </div>
            </div>
</div>