Logo upload problem

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Hello, there was a problem. When loading any page on the computer, my company logo is loaded, but this is not correct. (in the photo below you will understand). When the page is fully loaded, this white square disappears. The error occurs with both the png and the jpg file. This doesn't happen on mobile devices. I'm not a programmer and I understand that I need to do something with the code, could you tell me how to fix this error?