Got a Pebble and an HTC One? I found out why the One unlocks with just a tap.
Apparently, the reason why it does that is because a service in the Accessibility menu is on which would include Tasker, Pebble, Pebble Notifier, etc.
Anyway, I can't claim that I found the answer myself. I found it by searching on XDA (forum.xda-developers.com/showthread.php?p=40407262...). I thought that there would be some users here that might want to know.
Hope this helps if you're having trouble!