In your theme shortcodes are not being interpreted into content while post brief description output. For such cases there is a slider in our plugin and using it you can indicate what you would like to see in a brief description of the post.
You can find the slider into top left corner of the Content Editor.
You can set a short description of the post manually while you can't set it with the "more" slider.
1. Open the post and check if you have "Excerpt" enabled
2. Scroll down to the Excerpt field and past the text you want to appear as the short description of the post