Hi everyone,
I'm having trouble changing my availability information. This is a product with variants. The first two variants are available while the other two are not. Despite the fact that I choose a variant that is unavailable, the information that it is available is left. The price updates correctly. Information about availability is updated only after refreshing the page. How can I fix it? Thank you for your help 
Prestashop: 1.7.6.9
Link to product: