Emma, we face this same issue in Moodle 2.5.5+. Issue exists with both SCORM packages and Lesson activities. I hope someone else has more information to share.
Courses and course formats
The problem of Display of Course Completion
اس بحث کو بند کر دیا گیا ہے لہذا آپ اس کا مزید جواب نہیں دے سکتے۔