I think you should hide posts excerpt to make it look like other posts. You can do that by go to Customize > Other Layout Options > and check to "Remove Post Excerpt"
Thank you for your reply. I actually want the excerpt showing on all of them, I just hid them in the mean time because the site is live. How would I go about showing the excerpts and not the image shortcode?
This issue caused by you did deactivate a plugin make that shortcodes display.
Please check it again.
I do not have any plugins deactivated. Could you tell me which one would be causing the problem?