This is my today bug after adding some condition to disable or enable cash on delivery payment.

Why this happen? When you add a condition to load COD payment it will loaded after page load and because that JS does not have COD config. Then we need to remove Instructions from html template.

1: create requirejs-config.js app/code/Darvishani/COD/view/frontend/requirejs-config.js

var config = {
            map: {
                '*': {
                    'Magento_OfflinePayments/template/payment/cashondelivery.html':
                        'Darvishani_COD/template/payment/cashondelivery.html'
                }
            }

};

2 : create html template app/code/Darvishani/COD/view/frontend/web/template/payment/cashondelivery.html

<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<div class="payment-method" data-bind="css: {'_active': (getCode() == isChecked())}">
    <div class="payment-method-title field choice">
        <input type="radio"
               name="payment[method]"
               class="radio"
               data-bind="attr: {'id': getCode()}, value: getCode(), checked: isChecked, click: selectPaymentMethod, visible: isRadioButtonVisible()"/>
        <label data-bind="attr: {'for': getCode()}" class="label"><span data-bind="text: getTitle()"></span></label>
    </div>

    <div class="payment-method-content">
        <!-- ko foreach: getRegion('messages') -->
        <!-- ko template: getTemplate() --><!-- /ko -->
        <!--/ko-->
        <div class="payment-method-billing-address">
            <!-- ko foreach: $parent.getRegion(getBillingAddressFormName()) -->
            <!-- ko template: getTemplate() --><!-- /ko -->
            <!--/ko-->
        </div>
         <div class="checkout-agreements-block">
            <!-- ko foreach: $parent.getRegion('before-place-order') -->
                <!-- ko template: getTemplate() --><!-- /ko -->
            <!--/ko-->
        </div>
        <div class="actions-toolbar">
            <div class="primary">
                <button class="action primary checkout"
                        type="submit"
                        data-bind="
                        click: placeOrder,
                        attr: {title: $t('Place Order')},
                        enable: (getCode() == isChecked()),
                        css: {disabled: !isPlaceOrderActionAllowed()}
                        "
                        disabled>
                    <span data-bind="i18n: 'Place Order'"></span>
                </button>
            </div>
        </div>

    </div>
</div>

3 : clear cache and compile your code