Cannot remove blog logo from Appearance settings

I'm unable to remove my blog logo (both Light and Dark mode) from Dashboard → Appearance. I click the logo, remove it, save — but after refresh the logo reappears. Tried multiple browsers and incognito mode.
Publication ID: 68e6d6e8c012cd63acfa555d

<img width="1504" height="580" alt="Image" src="https://github.com/user-attachments/assets/a16a7bbe-4f3c-489a-bca8-aa0b615c96d5" />