Sometimes when you post links to your program listings on your website, the titles, image, and description is not related to the program.
If you are on a wordpress site, this issue can be caused by a popular SEO plugin called Yoast SEO.
Yoast can cause some problems with social sharing links, specifically facebook links. Yoast adds in tags that breaks the tags the retreat guru plugin puts on the page. These tags tell facebook which title, image and description to use in the facebook link preview.
But you can disable this part of Yoast, and it fixes the problem.
Here is a help article showing you which feature you need to disable.
"Deactivate generation of Open Graph meta data (a.k.a. Facebook Tags)"