Description in Preview Snippet does not match description in Description box

If I scroll nearly to the bottom of my Home page I come to the AIO SEO Pack section. It contains “Preview Snippet” which has the SEO title and description. Below that are the SEO Title and Description text boxes. The title in the Preview Snippet matches the title in the Title text box but the description in the Preview Snippet does not match the description in the Description text box. What’s in the snippet is an old description. It’s not updating to the new description in the text box. It’s been like this for 2 weeks. How do I update the snippet so it shows what’s in the description text box? Thanks.