Why does Android keep changing my lock screen code?

frazz0402

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Jul 29, 2015
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Android keeps changing my lock screen code

I own a LG G2 mini which recently upgraded to Android 5. I use a simple pin code to lock the screen, but ever since this upgrade everytime I turn my phone off it prompts me for a password instead. Inputting the pin numbers in the password field does not work and I'm forced to fail all attempts until the 'Forgot password?' button comes up, from which I can reset it by entering my google acccount details. This is highly annoying and I have no idea why it's happening everytime I turn off my phone. Is it a known bug? I have searched about this for a while with no results.

This phone is not rooted btw.