When setting up a Personal Fundraising page, we can select the photo that should be shared on Facebook and Twitter when those icons are clicked on the Main Page. However, when the link is shared, this is not the photo included in the post.
This was resolved in the 7.26.0 Release on 10/23/2016. You must re-upload the image to the Site Options and it must be at least 200 x 200 pixels in order for it to show up correctly in the Facebook sharing link.
Steps to Duplicate
Click the name of the Fundraiser
Click Step 2, Site Options
Note which photo is selected below the Sharing Options heading
Click the URL listed below the name of the Fundraiser
Click the Facebook icon below the Sharing heading
Log into Facebook to post
Click Post to Facebook
The photo included in the shared post is not the photo that was selected below the Sharing Options heading when creating the Personal Fundraising page.