Music Option controls when Screen lock

[AC Question]

Hi,

I am using Nexus 4, with latest android update.
While listening to music and the screen is locked,
We can see three options to control the music and album wallpaper on the screen.
Options are Previous, Play/Pause and Next.
It works fine for Play/Pause, but if we touch Previous or Next options, those operates for volume increase/decrease rather for Skipping songs.

How can I solve this?