Post Snippet Not Matching Content on Facebook

I’m not sure if this is a facebook problem, a problem with your theme, or a problem with my site. Our latest post on our group’s Facebook page is showing the snippet of from a few posts previously. This is reflected in the plugin on the sidebar of our site. Even when I paste the URL of a post on our site in my personal facebook page, the same erroneous preview pops up. This occurs when posting the URL of any part of our site (page, post, whatever). This does not happen with links to any other site. On our News page, which has snippets of all of our posts, the snippets are correct. Not sure what is up. I’d imagine this has something to do with the meta data of the posts perhaps? Thanks for any help you can provide.

Our Facebook page is here: https://www.facebook.com/virginiamontessoriassociation/?ref=aymt_homepage_panel.

Our WordPress site is here: https://virginiamontessoriassociation.org/