Training Completion & Progress tracking issue (BookMark Issue)

Background:

We have recently published a multi-language course to our LMS. The course is available in 17 languages, and users can select their preferred language from a language selection pane at the beginning. The course has been thoroughly tested, and no issues were identified during the initial testing phase. Once published we've been receiving user issues mostly to do with course completion and progress tracking. The summary of same is provided below.

Notes:

Before starting please note - 

• Not all users are affected; only a couple have reported these problems.
• These issues are specific to the German language version of the course.
• Using Cornerstone's LMS with no known compatibility issues.
• Course settings and triggers are consistent across all languages.
• The 50% bookmark slide consisted of a document icon with link to a PDF which also had no issues with it.

Summary of Issues:

1. Training Completion Issues:
   • Users are unable to record their completion of the training.
   • Clicking "complete course" does not trigger any action, forcing users to repeat the training.
2. Progress Tracking Problems:
   • Training remains at 50% and does not close properly.
   • The "close course" button on the last slide is unresponsive.
   • Users have to restart the training or resume from the 50% bookmark.