plasma-org.kde.plasma.desktop-appletsrc is overwritten during login

Hello, I am running Leap 42.1 with dual screening, using an nVidia Card GeForce GTX 750 Ti and driver 367.27. When I change the wallpaper on either one or both screens, after re-login the pictures are not displayed. The default background wallpaper is displayed instead. I have tried to change the location of my wallpapers and after selecting them again I can see the change in plasma-org.kde.plasma.desktop-appletsrc. I then logout, check the contents of the file and the filenames are still there. However, after logging in again, the file plasma-org.kde.plasma.desktop-appletsrc appears to be changed. Which program or script during login overwrites the file and why?