Library Group settings_how to replace the image logo

Hi,
Previously there was an image logo loaded for the library group.
I want to remplace the image. In the group settings, i have deleted the image and i loaded a new image. But when i save the settings, the previous image appears. I wait 1 day, and i did it again but no way, previous image appears again. where is my mistake !

How to replace the image logo of the library group ?
Thank you for your answer.
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