Browser, if a website issue (Safari 13.1.2, macOS 10.13.6) :
URLs (aka web addresses) of any relevant observations or pages: https://www.inaturalist.org/observations/56103171
Screenshots of what you are seeing:
Description of problem:
Step 1: In a comment click the down arrow.
Step 2: The menu that pops up is inside the comment box and therefor partially hidden.