Stock indicator does not change for variants

[NextOne]

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:

https://www.sauneo.pl/713-46-piec-do-sauny-finskiej-harvia-vega.html#/23-model-vega_bc45_45_kw_3_6_m3

 

Edited February 24, 2021 by NextOne
Add Prestashop version (see edit history)