The barcode finds a different product. How do I fix it?

Do not save the wrong product unchanged. Open the product's source and use the package-disagreement option to create your own food from the current label. Check the barcode, name, serving and nutrient values before saving.

Your corrected private version takes precedence for you in later searches and scans of that code. Submit Report this food with the label and barcode if you want the shared record checked. A code can stay the same after a recipe changes, so the current package matters. Old diary entries are not silently rewritten by the report.