Hi Jamila,
Thank you for your kind words!
Well, this might be something completely different, perhaps something unknown yet. Unfortunately I will need to be able to see both the back-end and the code as well to be able to debug through it. Can you please add them?
Also, can you please create a test post (or link me to a post) where you put the shortcode as you did, so I can investigate the error via FTP and see how it looks like from the back-end as well? It’s because I don’t want to make changes to your live posts 🙂