My windows 10 Lenovo laptop will not let me change my lock screen?

I have a Lenovo laptop with windows 10. Recently I tried to update my lockscreen to be a slideshow, but it did not work. So, instead, I went back to my previous picture.

Now, no matter what picture I set, it changes it to another one! I have no idea how to fix this, and all the microsoft community are talking about is bugs on Windows 8.1. How do I fix this to show the picture I select? It does not come up with an error message and for a while it keeps my picture, then changes again to the picture it prefers.

Do you still have this slide show running? Curious did this laptop come with windows 10 or did we upgrade to windows 10? Because windows 10 is still filled with bugs and glitches…