Extra security on lg g4 knock code

[Chonsadroid]

I have a lg g4 that we use to watch videos, netflix etc... but we have the knock code feature on it. Recently we tried to unlock, but the knock code is different, we try to unlock but it wont work it almost looks like a photo. Before if you got it wrong it will tell you try again, now we knock the code multiple times and nothing happens. Is there a extra function on the knock code that we dont know about? We notice it says profile on the drag down screen. Maybe an extra security to the knock code?