My background turns back to a particular old wallpaper if left for few minutes or restarted.

[Pranika]

When I personalize my background with new picture or the default given once. Within few minutes it turns back to another particular wallpaper which i once kept as my background. This doesn't happen in solid color, themes and slideshows. I have deleted this picture already but now i cant find how this happens and where it is located.

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