mobile

I'm sorry if this thread doesn't belong here but I have a question/problem: I have tried several lock screen apps and two of them seemed pretty nice though they had one VERY bad habit. I have my phone's sim card secured with a pin code and the lock screen apps I'm talking about kick in even BEFORE I get to the screen to unlock my sim card whenever I boot up or restart my phone. That is NOT normal behavior and I don't know if it's device specific or Android version specific since I have yet to see ayone else besides my sister complain about this particular issue. I have a Samsung Galaxy s3 mini running Android v4.1.2 and the apps in question are Hi Locker and Snaplock. So is this a bug within the apps or is this Android specific?