Thanks for your answer.
After some tests I think my child-theme code and files are not responsible of the issue.
I reinstalled a child-theme from initial xstore theme package (so no any custom on my part), then I deleted all my theme customs css and additionnal css + some customs js. The issue was still there.
After that I reset the Header builder and the issue disapear. So I think the issue come from your Header builder or settings in Xstore params.
You can check all this on the site. If you need the export of Xstore params (state before I reset the Header builder), I can send it to you.
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