Turning on Self Timer mode enables you to take photo 2, 5, or 10 seconds after pressing the shutter button. To disable or enable self timer shot on HTC One do as follows:
1. Open "Camera" app and tap the three dot icon
2. Tap "Self Timer" to configure the settings
3. Tap the Plus and Minus icons to set the timer from 0 to 10 seconds
** Set the timer to 0, so the self timer feature is disabled
4. Press the Back button and start shooting by tapping the camera icon.