Mock Locations option keeps turning off

I am trying to test an app i have been sitting on for a while. In order to do that i need to use the option "Allow mock Locations", so i set it to on. But as soon as i refresh the page it's gets automatically turned back off every single time. So i am unable to use this option. I tried finding if an installed app does effect that but as it turned out was not the problem there. This is the only rooted phone i have so i need to get this working on this device. I'm using 5.1.1, OnePlus X Anybody maybe with a similar problem or any suggestions? Thank you.