Asus Fn Sound Bar Display Error

Hey guys

I just have a small question about my Fn sound bar for my Asus laptop (V551L I believe). I run Windows 8.1. So I'm not sure if it's a display issue with Windows or with Asus.

My volume keys for Fn are fully functional, it's just the display when I have the the volume bar visible. Whenever I press either of the Fn buttons that make the volume increase or decrease, the volume bar lights up, then greys out as if it would if you were to press the mute button. But the the volume still remains on.

It's a silly concern really, but I'd like to know what's probably causing it.

Just to be more clear of what the volume bar looks like, I'm including an image.