Menu pages doesnt show section

Hello

I am new user of WordPress and I am stucked in this problem. In my front page is everything OK, Sections are showing well, but when I try to add section to other pages, for example “O MNĚ” (About me), then I dont see any sections. Am I doing something wrong, or it its some bug? Please Help, thanks.

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