Allow Mock Locations not switching on

I would like to use the Allow mock locations feature on my C6802, but it doesn't turn on. I tap the checkbox and the box turns on, but when I close the screen and go back to settings it is automatically turned off. I don't know what's causing this, I have reinstalled all my apps that request root. Still the problem remains.

Xperia Z Ultra, rooted, Stock ROM, SuperSU, Xposed installed.