Add to Cart not working properly

Good day to you, I hope you are well,

I am having a strange problem with my “add to cart” button, specifically for products with many variations. When I try to “Add to cart” products with 45 variations, the following happens:A small loading screen pops up and never closes, I can close it but I don’t recieve any notification that my product was added to the cart. It doesn’t happen for my other products, just the ones with 45 variations.

Here is a link to one of the products with that issue: https://www.laramello.com.br/produto/103/

System status:

### WordPress Environment ###

Home URL: https://www.laramello.com.br
Site URL: https://www.laramello.com.br/wp
WC Version: 2.6.9
Log Directory Writable: ?
WP Version: 4.7
WP Multisite: –
WP Memory Limit: 256 MB
WP Debug Mode: –
WP Cron: ?
Language: pt_BR

### Server Environment ###

Server Info: Apache
PHP Version: ? 5.5.38 - Recomendamos PHP 5.6 como vers?o mínima. Veja: Como atualizar a vers?o do seu PHP
PHP Post Max Size: 65 MB
PHP Time Limit: 30
PHP Max Input Vars: 1000
cURL Version: 7.35.0
OpenSSL/1.0.1

SUHOSIN Installed: –
MySQL Version: 5.6.28
Max Upload Size: 64 MB
Default Timezone is UTC: ?
fsockopen/cURL: ?
SoapClient: ?
DOMDocument: ?
GZip: ?
Multibyte String: ?
Post Remoto: ?
Remote Get: ?

### Database ###

WC Database Version: 2.6.9
: 
woocommerce_sessions: ?
woocommerce_api_keys: ?
woocommerce_attribute_taxonomies: ?
woocommerce_downloadable_product_permissions: ?
woocommerce_order_items: ?
woocommerce_order_itemmeta: ?
woocommerce_tax_rates: ?
woocommerce_tax_rate_locations: ?
woocommerce_shipping_zones: ?
woocommerce_shipping_zone_locations: ?
woocommerce_shipping_zone_methods: ?
woocommerce_payment_tokens: ?
woocommerce_payment_tokenmeta: ?

### Active Plugins (17) ###

Ultimate Addons for Visual Composer: por Brainstorm Force – 3.16.6
Facebook Like Box: por Vinoj Cardoza – 2.8.8
Formulário de contato 7: por Takayuki Miyoshi – 4.6
Essential Grid: por ThemePunch – 2.1.0.1
8theme Post Types: por 8theme – 1.0
Google XML Sitemaps: por Arne Brachhold – 4.0.8
Instagram Feed: por Smash Balloon – 1.4.8
WPBakery Visual Composer: por Michael M - WPBakery.com – 4.12
Master Slider Pro: por averta – 2.29.0
Slider Revolution: por ThemePunch – 5.2.6
Screets Live Chat: por Screets Team – 2.2.3
Simple Custom CSS: por John Regan
Danny Van Kooten – 3.3

String Locator: por Clorith – 2.0.3
Instagram Feed WD: por WebDorado – 1.1.17
WooCommerce PagSeguro: por Claudio Sanches – 2.11.4
WooCommerce: por WooThemes – 2.6.9
YITH WooCommerce Wishlist: por YITHEMES – 2.0.16

### Settings ###

Force SSL: –
Currency: BRL (R$)
Currency Position: left
Thousand Separator: .
Decimal Separator: ,
Number of Decimals: 2

### API ###

API Enabled: ?

### WC Pages ###

Base da loja: #2418 - /loja/
Carrinho: #2528 - /cart/
Finalizar compra: #2420 - /finalizar-compra/
Minha conta: #2421 - /minha-conta/

### Taxonomies ###

Product Types: external (external)
grouped (grouped)
simple (simple)
variable (variable)

### Theme ###

Name: Classico - 8theme WordPress theme
Version: 1.7.1
Author URL: https://themeforest.net/user/8theme
Child Theme: ? – Caso você esteja personalizando o WooCommerce em um tema pai que você n?o desenvolveu
ent?o recomendamos utilizar um tema filho. Veja como criar um tema filho

WooCommerce Support: ?

### Templates ###

Overrides: classico/woocommerce/archive-product.php
classico/woocommerce/cart/cart-empty.php
classico/woocommerce/cart/cart.php
classico/woocommerce/cart/cross-sells.php
classico/woocommerce/cart/mini-cart.php
classico/woocommerce/checkout/form-billing.php
classico/woocommerce/checkout/form-checkout.php
classico/woocommerce/checkout/form-shipping.php
classico/woocommerce/content-product.php
classico/woocommerce/content-product_cat.php
classico/woocommerce/content-single-product.php
classico/woocommerce/content-widget-product.php
classico/woocommerce/global/breadcrumb.php
classico/woocommerce/global/form-login.php
classico/woocommerce/global/quantity-input.php
classico/woocommerce/global/wrapper-end.php
classico/woocommerce/global/wrapper-start.php
classico/woocommerce/loop/add-to-cart.php
classico/woocommerce/loop/loop-end.php
classico/woocommerce/loop/loop-start.php
classico/woocommerce/loop/no-products-found.php
classico/woocommerce/loop/pagination.php
classico/woocommerce/loop/sale-flash.php
classico/woocommerce/myaccount/form-edit-address.php
classico/woocommerce/myaccount/form-login.php
classico/woocommerce/myaccount/my-orders.php
classico/woocommerce/single-product/add-to-cart/simple.php
classico/woocommerce/single-product/product-image.php
classico/woocommerce/single-product/product-thumbnails.php
classico/woocommerce/single-product/related.php
classico/woocommerce/single-product/sale-flash.php
classico/woocommerce/single-product/short-description.php
classico/woocommerce/single-product/tabs/additional-information.php
classico/woocommerce/single-product/tabs/description.php
classico/woocommerce/single-product/tabs/tabs.php
classico/woocommerce/single-product/up-sells.php
classico/woocommerce/single-product-reviews.php
classico/woocommerce/single-product.php

Thank you