Short code appear in my site

Hi, Download After Email team,
Thanks for this great plugin, recently I activated a new theme on my staging site, and I found one of the shortcode appears in the text, how should I do to delete the shortcode on this text?
Pls check this link to see the code I mean as the access to the URL of the staging site will be denied:
https://drive.google.com/file/d/1-Da5rJFEcWYT9wlDsuJ0N3b-QZJS8GeB/view
And when I click this download page, the “free download” button has gone, as you can see from this picture:
https://drive.google.com/file/d/1MutbNZimDBVzZBBos2Xt1nSrdSFFQ7uJ/view?usp=drivesdk
What should I do?

Looking forward to hearing from you soon.
Best regards,
L

The page I need help with: [log in to see the link]