checkout page acting crazy

Hi guys- This is my first time creating a site on wordpress. I connected it with woocommerece.

When I buy a product and add it to cart and enter my shipping info. The page starts going up and down. I am not sure why it’s acting like that.

Can you guys please help?

It also says no valid shipping method on the checkout page. I activated free shipping on the shipping tab of woocommerce.

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