I recently bought this tablet, and I really like it for the few things I wanted to do with it.
But a little bug is starting to grind my gears, I searched for other people with the same problem but my time is short these days and I simply thought it would be easier if I ask it.

For the problem, the volume rectangle at the top left of my tablet's screen disappear when I raise the sound at 2 to 100 like usual but when I remove it totally ( at 0 ) the rectangle stays and never disappear, even in desktop, applications, games.. Even if I restart the tablet he's back at his position.

It never happen before, I didn't installed new software or programs of any kind. I opened it like everyday.. I don't think I did something wrong.
If someone know how to fix this it will be appreciated