Hi Jaroslav,
Yes, this is a quirk with Lesson. In Multianswer all correct answers must be the same score and all incorrect answers should have the same score as well.
At the end, the Lesson module finds the highest score per question and totals that for the total points possible. In your case, 20. It is not however an aggregate of all the points in the Lesson, which is what you were thinking (the 35).
Hope this helps,
Mark
Lesson
Also multianswer scoring problem.
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