Please see if this helps:
Windows 10 lockscreen image
my chosen back ground for Windows 10 lockscreen always reverts to a default image.
Windows for home | Windows 10 | Settings
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Anonymous
2018-01-20T03:48:39+00:00 -
Anonymous
2018-01-19T23:26:14+00:00 I'm Greg, a volunteer installation specialist and 8 year Windows MVP, here to help you.
Are you choosing the Picture choice from the dropdown menu at Settings > Personalization > Lock Screen, and then browsing to the picture to select it?
If so and it still changes then you can find out how to manage the folder where these are stored here:
http://www.thewindowsclub.com/save-spotlight-lo...
http://www.thewindowsclub.com/wallpapers-lock-s...
I hope this helps. Feel free to ask back any questions and let us know how it goes. I will keep working with you until it's resolved.
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Anonymous
2018-01-19T22:48:14+00:00 Are you connected to the Internet? Because they are dynamic images sourced from Bing.
Open Start > File Explore > This PC
Select the View tab then check Hidden Items
Copy and paste the following into the address bar
%USERPROFILE%/AppData\Local\Packages\Microsoft.Windows.ContentDeliveryManager_cw5n1h2txyewy\LocalState\Assets
Right click settings.dat and roaming.lock each,
Rename each respectively settings.dat.bak and roaming.lock.bak
Restart your computer
Open Settings App > Personalisation > Lock screen > click in the 'Background', list box then choose Windows Spotlight.
Other things you can try.
Open Start, type: regedit
Right click Regedit
Click Run as administrator
Navigate to the following key
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Authentication\LogonUI\Creative\S-1-5-21-826134325-3229497062-2753576501-1001
this will be your first user, if you got more change on all of them:
Double click LockScreenOptions
Change the Value data to 4
Click OK
Exit the Registry then restart.