magnifying glass replaced by a U ??? in the main menu..

Dear experts,

Thank you for this theme, it is just what I was looking for.

Something strange however, I have a big U instead of the magnifying glass (loupe) in the main menu. It does not correspond to the theme demo.

You can clearly see this little issue at mes sommets.

If you could provide me some help, I have tried to check where it is happening but I got lost.

As well, I have created a child theme for specific needs, but the main theme is freshly downloaded.

Best regards,

Benjamin