Originally Posted by Protibus
There's a delay of up to 15 minutes for lock but it has no affect if the power button is pressed to put the screen off. If the power button is pressed it immediately locks.
Sent from my HTC6525LVW using XDA Free mobile app
I just tested it on mine and it didn't do what yours does. If I pick 15, hit power button, then immediately wake - no lock. If I pick immediately, it does just that.
Something's wonky with yours.
Sent from my HTC6525LVW