[How to do instruction] Use hardware momentary switches to control moOde

[alekmaker]

I use 5 gpio buttons to switch playlists and two to next/prev
Change playlist work good, but next and prev doesn't.
If I check buttons thru "gpio readall"  I see - buttons is works, if I use "sudo /var/www/command/gpio-buttons.py"
I see when I push to next and prev nothing happening, all another buttons work. 
Why? What I did wrong?
see the attached screenshots: