Your Login images used to change automatically since the windows has a series of images set to automatically change at a given frequency. In your case, you only applied one image thus the login screen has only one image to play making it use the available image in settings. Go to the settings >> Personalization >> Lock screen under background choose picture or slideshow to use your own images or stick with Windows Spotlight wallpaper as shown below. You can set any amount of images as your wallpapers and also set the frequency based on your preferences.
If the usual steps don’t work for you, then I suggest you follow the advanced steps to fix the spotlight issue.
Let us know if your problem was solved.
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