Can't turn on app permission

Hi guys, i'm having some problems with my OP3.
There is this specific app that won't work, and the reason for it not working is because I can't turn on this specific permission.

Does anyone know why it wont turn on, and what I can do to fix this so I can turn it on?
Everytime I turn it on, I then close out and go back into the permissions and it's disabled again...wtf

Thanks

I'm using a OnePlus 3 A3000