Quizzes not syncing

[oneilllj]

A teacher has created three quizzes in a blueprint and synced these to the related courses. However, students in one of these synced courses cannot access the quizzes at all. When I try to open a quiz the "copying assignment" wheel appears. 

Why has it worked for one course and not the other? 

How can I help the other course and students access the quizzes?

Thanks in advance.