Desktop background keeps reverting to a specific picture every time I change it

[Windows 11]

Desktop background keeps reverting to a specific picture every time I change itI have an original Windows 11 installation on a brand new asus laptop.The desktop background came preconfigured to a picture. I want to change it from that picture to a solid black color.I right-click on the desktop and choose "Personalize", then "Background", then change "Picture" to "Solid Color", then choose black.Then the desktop background changes to black as expected.After about a minute, the background changes back to the original picture. It's always the same picture. I am not running multiple monitors. I've

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