Code:
            <!--bof Product details list  -->
            <ul id="productInfo-productDetailsList" class="productDetailsList list-group mb-3">
                
                
                <li class="list-group-item">Availability: <strong>1 Units in Stock</strong></li>
                <li class="list-group-item">Manufactured by: <strong>GB Products</strong></li>
            </ul>
            <!--eof Product details list -->
Give us the code from includes/templates/bootstrap/templates/tpl_product_info_display.php