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Hi,
I'm not able to reproduce the behavior you are experiencing. You could first of all try to clear data for camera under settings > apps> all > camera > clear data. Restart the device and try again. If the behavior persists, I would suggest that you try to boot your phone into safe mode to see if the problem may be related to any 3rd party app that you have installed in your phone:
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
I know that a restart helps.
Mostly form the lock screen and the camera short link on the buttom of the screen forces the bug.