What setting did you do initially while configuring this lesson?
I have used lesson within my course (in Moodle 2.7) at two different points with varied results. The only difference within the setting was that for the first one (see Fig 1 in attachment - Lesson Name: Activity & Assignment: Peer Instruction - What,Why and How?) I had initially set it up for No student review and later changed it (may be after 10~15 students attempted the lesson).
For the second lesson (Fig 2 in attachment - Designing Lesson Plan with Visualization), the students are able to review their attempt while for the first, they are not. Since I had essay questions in both, I did not want them to retake the lessons.
I am a moodle newbie teacher so do not have much insight as to why this happened? But hope this info helps.