variable product, options not appear on product page&signing out of stock

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Hi,

I set attributes and terms, and also set prices each option of product.
On the preview, the options are well shown.
However, on the product page, the options do not appear and there is a sign ‘This product is now out of stock and not possible to purchase’ although the products are all in stock.
The options are located in additional information like a stuation occurred when the product type is simple product.
I already tried some ways such as updating theme and woocommerce, and regenerating the product lookup table, but it still does not work.

Please let me know how I can solve the problem.

Thank you.