An empty action in the form on the order detail page (User's personal account). Where to look?

Question

1C-Bitrix

Online store on 1-C Bitrix. Immediately after placing an order with online payment, there are no problems (i.e. the payment method works, the payment goes to the bank, etc.). But if the order is not paid immediately, then the "Pay" button in the order card (the one in the personal user account) does not work. When you click on ajax, another div opens with another pay button, and when you click on the last one, you go to the list of orders in the personal account and that's it.
The code below is already from the browser, I'm confused by the empty action in the form, but I don't know where to look for it and what to edit. Please help.

<div class="row sale-order-detail-payment-options-methods-template">
  <span class="sale-paysystem-close active-button">
    <span class="sale-paysystem-close-item sale-order-payment-cancel"></span>
    <!--sale-paysystem-close-item-->
  </span>
  <!--sale-paysystem-close-->
  <div class="col">
    <form action="" method="get">
      <input type="SUBMIT" value="Оплатить">
    </form>
    <!--<a class="sale-order-payment-cancel">-->
    <!--</a>-->
  </div>
</div>