I have some clips in Redactor 3.1.0-pl and it only shows the first item. Clicking it only inserts the first item also.
[ ["Summary + Details Expander", "<details><summary>Title Goes Here</summary><p>Details go here.</p></details>"], ["Aside Box", "<aside><p>Side box information goes here.</p></aside>"], ["Paragraph", "<p>Simple Paragraph</p>"] ]
This may have happened during the upgrade from v3.0. I don’t remember this problem before upgrading and I don’t think I have looked in the Redactor settings since.
Possibly related to this which also showed up recently.