Grant mentioned that he had images he couldn't get rid of.
The issue was that there were images that had been uploaded that weren't included in the body of the post, so appear below at the bottom of the post under the Attachments title.
You can see the last two images appear below the ATTACHMENTS title
If you click on attachments you can then see that there are 4 attachments but only two of them are referenced in the body of the post. The forum will shows any attachments uploaded to the post that aren't referenced in the body of the post at the bottom of the post.
To remove them just identify which attachments you want to remove and click the delete button.