This thread is resolved. Here is a description of the problem and solution.
When we switch to a secondary language and press the website's logo are added "%2f" after the string "?lang=en" in URL.
Change URL structure to "language in directories at WPML -> Languages. Then save permalinks.
Relevant Documentation: https://wpml.org/documentation/getting-started-guide/language-setup/language-url-options/
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