Yo need to check the default Meta Tags Placeholder template - to check the data held in here is OK
When you create a New Menu Item to save you time information is pulled across from the default Meta Tags template to save you time in populating these fields. It is displayed as collapsed as once you have the correct information this often remains static, so there is no need to display this each time.

When you click on the modify button the information is collapsed, so you need to click on the small + icon to expand the information
 Please check this information is correct and make any changes if necessary

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