Editor deleting portions of post and adding characters

When I save a post in the editor and/or publish the post, it will often delete most of the post. When I revert to past versions, characters like  and “ get inserted in many places, specifically where ” and ‘ used to be, but also in other areas with no character replacement.

I searched and found some posts on the Â, but nothing on the bigger problem which is the deleted portions of the posts.

Site: http://saintignatiuseye.org

Some of the published posts show evidence of the errant characters and many are clearly cut off too soon.