Hey Mark,
Is there a reason why every time I delete and empty the trash can in easy blog that any blog gets re-posted to Facebook?
Do you mean when you delete all the trashed post from backend, it will reposted into your Facebook page?
If yes, that was strange, can you provide us with your Joomla backend, FTP and Facebook access so we can better have a look?
Also, if I update a blog post and un-check the box to post to Facebook it re-posts it anyways?
Yes, as long as you enabled this option
`Autopost On Post Being Updated` from Easyblog Facebook autopost configuration page, it will autopost to your Facebook page, this is the default behaviour.
Regarding the checkbox is for the is it want to autopost to your Facebook user profile page.