A lot of white space when using [su_spolier]

Is there a limit as to how many [su_spoiler] I can put on a page. I have a very long alpha list of item. When I started on letter “E” all I have showing on the page is large white space between items. http://quantum.esu.edu/library/databases/a-z-directory-listing/

https://wordpress.org/plugins/shortcodes-ultimate/