Don't worry you just have the Asus bios bug. Everyone has been getting it when testing out new overclocks. You just need to reflash bios.
If you have any settings in bios that do not carry through, get stuck, or seem to change on their own then you have encountered the bug. Just reflash bios and you will be good, well good until you eventually encounter it again.
Download the bios file, use the renamer utility to name it correctly, and place the renamed file on a fat32 USB stick. Shut your machine down, but leave the power plugged in. Place the USB stick in your designated flashback usb port then hold the flashback button for three seconds until the light starts blinking. Wait a few minutes for it to finish.
Start the machine up and you are good to go. Before doing this, export your saved profiles to the usb stick because you will lose all your settings and profiles. Once the procedure is done you can reload your saved profiles from the usb. The saved profiles will work as long as you are reflashing the same bios version.
You will be able to make several changes to bios before encountering the bug again. It all depends on how much instability you create. A way to minimize that is work backwards with your vCore instead of upwards when testing. Eventually when the bug pops up again, just follow the reflash instructions again.
By the way make sure to check out this thread for the best oc advice on Asus mobos: