Cant use weapon in 2nd weapon set when i have 2 weapons, but i can use them both individually

https://imgur.com/a/CWMwXh1

Cant use weapon in 2nd weapon set when i have 2 weapons, but i can use them both individually at any weapon set

League: 2nd wind Fate of the Vaal

In the normal Fate of the Vaal league, it works fine