You use double sidebars "wpForo Sidebar" and "Page Right Sidebar". I don't recommend it. You should edit the forum page, set it full width to remove the main right sidebar. In Appearance > Widgets admin page remove all widgets from wpForo Forum Sidebar.
I did it thanks to you.
But there is a new problem.
I try to explain with picture. I hope you will help me again.(There are 2 ss in pic. First one a single page, 2nd one is forum page.)
The wpForo sidebar is located in page content area so the widgets style will be different. You should do the vice versa. Remove all widgets from wpForo sidebar to remove it and edit the forum page and set it right sidebar template as It was before. It was correct before, you just need to remove all widgets from wpForo sidebar.
