Why has my lock screen changed?

[Android Central Question]

So when I got my phone my lock screen was normal but now recently every time I lock my phone, another screen comes up and shows all my notifications and also every time I put my phone on charge the other screen comes up and I need to slide left every time. I don't know how it happened and how to stop it

 

[B. Diddy]

Welcome to Android Central! Are there any ads on that screen as well? It's probably a hidden "feature" associated with some other app that you installed, and these sneaky additional lockscreens often have ads on them. Boot the phone into Safe Mode and see if it goes away. (Let us know which phone you have, since different phones may have different methods of getting into Safe Mode.)