Subforum Title Menu and Wpforo Tıtle
you have set the same ID for both boards, and that is wrong.
Check this and do the same:
Page1 ID: 6 | Board1 ID: 6, Page1 slug: forum | Board1 slug: forum
Page2 ID: 7 | Board2 ID: 7, Page2 slug: forum-en | Board2 slug: forum-en
When ı change the page ıd ıts gıvıng error forum-en
|8 not found|