[Plugin: WooCommerce] Display price & add-to-cart button on variable product pag

I’m working on a custom theme for a woocommerce shop, and i can’t display the active price (depending on the option selected) and the add-to-cart button…
I did a copy-paste of the variation form from “variable.php” template, and i don’t understand what i’m missing. If i activate Twenty fifteen theme, it works fine.
I read it could be a js conflict, but i don’t get any alert or error in my javascript console.
I also tried to delete the “style=display:none” from <div class=”single_variation_wrap”> to display the price and button, but nothing shows…
Here is the link to my variable product page (french) : https://lechienparisien.com/produit/produit-variable/
(you’ll see in the source code that i commented my table with price and add-to-cart button, and replaced it with copied-pasted variable.php code)

Thanks for your answers !