Fingerprint security problem

Has anyone else had a problem with the fingerprint security. When my phone is locked and on lock screen I have phone and camera app in the corners. If I open the phone app it doesn't ask for a fingerprint scan and I can make calls then if I back out of it the phone is unlocked never asking for a fingerprint or password. Why have the fingerprint for security if all you have to do is open the hone and then hit home button or back button.

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