Nesting expand shortcode

I am trying to next to expand shortcodes. When you click to expand the first one, it works perfectly. But the second shortcode appears as text. It doesn’t insert code.

Here is the code I use to create the second (nested) shortcode.
[_su_expand more_text=”Start Now” height=”0″ hide_less=”yes” link_style=”button” link_align=”center” class=”start_now”][wpforms id=”471″][_/su_expand]

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