Problem with product variations

Good morning

we have verified a strange behavior on one of our e-commerce, we think it is a bug.

The problem occurs when we customize a product with variations and put it in the cart.

If we immediately try to customize another variant of the same product, the "add to cart" button is disabled.

Have you found it too? do you think there is a way to fix it? Are we mistaken for some configuration parameters?

Thank you have a nice day