I found my solution here
“WooCommerce Variable Products all showing out of stock: Sorry, this product is unavailable. Please choose a different combination.”
https://www.sotechdesign.com.au/woocommerce-variable-products-showing-stock-sorry-product-unavailable-please-choose-different-combination/
Ignore my issue please, I’ve made a mistake. Just realize that i inserted twice the php short-code script.
Now it works super!
Same case for me… Also I’ve realized that then you re-size the window expanded menu is showed just for a portion of second. 🙁
