Expand shortcode doesn't work

Text appears already expanded. Is anyone else experiencing this problem? Any insights would be much appreciated.

This code: [su_expand]This text block can be expanded[/su_expand]

Produces this result:
http://postimg.org/image/liwdx78j5/
http://postimg.org/image/5lxm0hg4x/

https://ww.wp.xz.cn/plugins/shortcodes-ultimate/