這是我表單中的其中一段

目前沒有什麼問題，可是當我按下同上鈕之後就會變成這樣

所以想請各位幫我看看是哪裡有問題，謝謝。

html

 <div class="row-flex">
                                    <div class="col-label">
                                        <label class="control-label"><label class="Required"></label>居住地址</label>
                                    </div>
                                    <div class="col-input">
                                        @Html.Action("Address", "NcTwTown", new { area = "Partial", CityId = "ParCity", CityValue = Model.City, TownId = "ParTownship", TownValue = Model.Township })
                                        @Html.TextBoxFor(m => m.Address, new { @class = "form-control" })
                                        @Html.HiddenFor(m => m.City)
                                        @Html.HiddenFor(m => m.Township)
                                        @Html.ValidationMessageFor(m => m.Address, "", new { @class = "valid-error" })
                                    </div>
                                </div><!-- /.row -->
                                <div class="row-flex">
                                    <div class="col-label">
                                        <label class="control-label"><label class="Required"></label>戶籍地址</label>
                                    </div>
                                    <div class="col-input">
                                        <div id="divA">
                                            @Html.Action("Address", "NcTwTown", new { area = "Partial", CityId = "ParGovCity", CityValue = Model.GovCity, TownId = "ParGovTownship", TownValue = Model.GovTownship })
                                        </div>
                                        <div id="divB">
                                            <select id="ddlTmpA" name="ddlTmpA" class="form-control select2">
                                                <option value="">請選擇</option>
                                            </select>
                                            <select id="ddlTmpB" name="ddlTmpB" class="form-control select2">
                                                <option value="">請選擇</option>
                                            </select>
                                        </div>
                                        @Html.TextBoxFor(m => m.GovAddress, new { @class = "form-control" })
                                        @Html.HiddenFor(m => m.GovCity)
                                        @Html.HiddenFor(m => m.GovTownship)
                                        <input type="hidden" id="tmpGovAddress" value="" />
                                        <div class="icheck-row input-group-others">
                                            <label class="control-label">
                                                  @Html.CheckBoxFor(m => m.IsSameAddress)同上
                                            </label>
                                         </div>
                                                
                                                @Html.ValidationMessageFor(m => m.GovAddress, "", new { @class = "valid-error" })
                                        </div>
                                    </div><!-- /.row -->

Jquery

$(function () {
 divABShow('@Model.IsSameAddress');
   $('#IsSameAddress').on("ifChecked", function () {
            $('#GovCity').val($('#ParCity option:selected').val());
            $('#GovTownship').val($('#ParTownship option:selected').val());
            $('#tmpGovAddress').val($('#GovAddress').val());
            $('#GovAddress').val($('#Address').val());
            divABShow(true);
            $('#GovAddress').prop('readonly', true);
        });

        $('#IsSameAddress').on("ifUnchecked", function () {
            $('#GovCity').val($('#ParGovCity option:selected').val());
            $('#GovTownship').val($('#ParGovTownship option:selected').val());
            $('#GovAddress').val($('#tmpGovAddress').val());
            divABShow(false);
            $('#GovAddress').prop('readonly', false);
        });
 })