Actually, I think he is right. If that second lock screen is the one he displayed, it should be due to the ES File Explorer. I read through the entire chat, and tested this myself. On that second lock screen, on the top right, there is a settings button. If you click on that, it leads you to ES Charging Boost. Turn that off, and the second lock screen is gone. I used to have that second lock screen display every time I locked my phone, and now, even after restarting, it does not appear. I only know that this remedy applies for that specific lock screen posted by Jerry, if there is any other one, I do not know if it will work.
BTW, on the first page of this thread it says "Seems like it's an 'added benefit' in order to prevent pocket dialing." This was gleaned from other forums by the person posting, and has no official confirmation. The confusion of the Samsung support staff appears to correlate with this.