Why can't I change my lock screen wallpaper?

[Android Central Question]

I changed my wallpaper from theme store now i try to change it but the home screen wallpaper changed and lock screen wallpaper does not changed

 

[B. Diddy]

Welcome to Android Central! I assume you have a Samsung phone -- which one? Have you tried changing the theme back to default, then trying to change the lockscreen wallpaper?

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