If it doesn't work on repetition - just refresh page. Or you can proceed by using keyboard and next questions started from second - will work properly.
This issue is known.

Install

• License: GNU General Public License v3.0 or later
• Weekly downloads: 0
• Average daily users: 3
• Rating: 0/5 of 0 ratings
• Created: 2020-08-08 20:20:06
• Last updated: 2022-06-08 17:46:23
• Homepage: https://github.com/YuriiZhydetskyi/LinguaLeo-Complicator
• Support site and email
• Orig: https://addons.mozilla.org/en-US/firefox/addon/lingualeo-complicator/
• API: {8fbab6e4-addd-46f6-8945-6692b69c7e37}