Your site is likely due to something accidentally added to the layout/theme.liquid file. Here’s how you can fix it:
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Go to your Shopify admin>Online Store>Themes.
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Click “…” (three dots) on your current theme, then click Edit code.
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Open the layout/theme.liquid file.
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Check right at the top of the file, before the line — sometimes extra code gets pasted there by mistake.
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Look for anything unusual like Random characters or text,Unclosed or broken HTML tags,A snippet or script that doesn’t belong
Delete the strange code and make sure your file starts cleanly. -
Click Save, then refresh your storefront to see if it’s fixed.
Please send us your store collaborator request code and Site URL so that we will able to send an access request and then investigate and try to fix the issue.