Problem with double variation

Hello!
I have some problem with double variation. If I choose two variations and put the product into cart I get second variation with incorrect title, adds “amp;pa_{title}” on cart and checkout page. Also instead of the attribute name, displayed attribute slug

Screenshorts:

https://prnt.sc/qtd4yx
https://prnt.sc/qtd5u5

I can see this problem on catalog page. If I add an item from catalog and after that with the same variation add item from product page, in cart I can see that products as two different items.

https://prnt.sc/qtd8am

Can you help with this problem?

The page I need help with: [log in to see the link]