Sequence problem in Lesson Cluster

Sequence problem in Lesson Cluster

by Betty Voon -
Number of replies: 0
I have a sequence of questions:
Cluster Q1 Q2 Q3-Q3a Q4 EndCluster
Q3a should follow if the student answer Q3 correctly. I find that the Q3a never appear and the cluster never end even though the setting of the lesson is in default setting. 
What can I do so that the system work as I desired?
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