Hey, having a problem, but not found any resolution for this

Have simple form

                    <form id="form666" data-request="onSendForm">
                        <div class="form-header">
                            {{ 'CONTACT US'|_}}
                        </div>
                        <div class="field-group">
                            <input type="text" name="form_name" id="form_name" required placeholder="{{ 'Name'|_ }}" name="name" />
                        </div>
                        <div class="field-group">
                            <input type="email" name="form_email" id="form_email" required placeholder="Email" name="email" />
                        </div>
                        <div class="field-group">
                            <input type="text" name="form_tel" id="form_tel" required placeholder="{{ 'Telephone'|_ }}" name="phone" />
                        </div>
                        <div class="form-submit">
                            <input type="submit" name="submit" value="{{ 'CONTACT US'|_}}" />
                        </div>
                    </form>

But if I hit submit, it goes and the empty record is made. How can I cancel this? This will spam on me )

Thanks

Update - not working in Safari Firefox and chrome goes well