Cannot save customizer settings

Would you be able to provide us with Temporary Admin access so we can take a look at the issue?
You can send login details via the Account Issue form:

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Please add the URL of this topic to the form so we can track.

Done, thank you! :)

Thanks :) I need the URL as well - you can edit your original topic and use the Site URL field.

I added the URL

I disabled Gutenberg and then removed your logos from the Customizer > Site Identity.
Then re-activated Gutenberg and now the Customizer saves correctly.

So the problem is the logos - possibly some funny characters in the file name.
Can you re-save your original logo with a new name. No hyphens, special characters and retry adding them.

Thank you David, everything works now fine! :)

You're welcome