Liam here from Shopify - thank you for your question :)
It is sounding like here that some custom content may have been added to one of your sections which could have been missing some code, for example a closing </div> tag. Could you post a link to your store here so we could take a closer look? If this is being caused but some rogue code, your Theme Developer may need to fix this by adjust the code from the back-end. If so you would be looking to contact your Theme Developer at this link.
Hope this helps, if you have any other questions, just let me know!
Can you please tell me which code did you added??
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|2 hours ago|