Product Page – Product image gallery/slider broke

Hi!
I am quite new to woocommerce and I am needing some help, please!
I have the 4.5.2 WP version installed and the 2.5.5 Woocommerce one.

I have set 3 images for the product slider when you are inside the single product page, and a single image for the Product Image. when I go inside the single product page, there is no slider or image gallery and, on the other hand, the main product image that I had set is completely out of size making it way larger than the 400×400 that is set on the Settings page. When you click on any of the mini product images it will link you to a blank page with that image, and it won’t change the main picture keeping you in the Single Product Page.

You can check everything I have just described in this URL: http://hewkeratin.com.ar/producto/alisado-plastificado

I have tryed updating everysingle plugin and WP in general but still wont work.
If you have any clues on where start looking for a solution I will be very thankful, thanks!

https://wordpress.org/plugins/woocommerce/