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No, the problem doesn't stem from the header.tpl file itself, but most likely from the incorrect integration of the Google Tag Manager (GTM) code—specifically the <noscript> section.
What you're describing (the GTM ID visible on a white background at the top of the site) almost always occurs when the GTM code is misplaced or misinterpreted by the theme.
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No, the problem doesn't stem from the header.tpl file itself, but most likely from the incorrect integration of the Google Tag Manager (GTM) code—specifically the <noscript> section.
What you're describing (the GTM ID visible on a white background at the top of the site) almost always occurs when the GTM code is misplaced or misinterpreted by the theme.