Hummingbird Crashes WooCommerce Checkout

Hi there, hope you're all good there!

When I activate Hummingbird (even all Clean nothing enabled) it breaks part of my WooCommerce Checkout Page (freigt calculator just pops page up, page background disappears, and multiple Ajax errors). I've attempted all solutions but, as Hummingbird gets on, my WooCommerce Store gets off... Any solution? Try to go there add some products and proceed to checkout (try to calculate "Frete")

parapro.com.br --> will redirect to my mini e-commerce page