The main title is not showing correctly on the front-end

Hi, when polylang is active on my website and when I’m on the front-end, the main title of my wordpress is not showing correctly. My title is modified in the settings section and on the Appearances page too. My title is “PivoFLEX” but on the frontend, it keeps writing and telling “Mon site WordPress”, like if was not updated. When I deactivate Polylang, everything’s working fine. Thanks.

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