Here is Canvas object wihch demonstrate the problem.
Concept Checkpoints is a series of easy-to-answer questions designed to call attention to various aspects of theory.

Click checkpoints to proceed.

CHECKPOINT QUESTIONS
Total: Sets:
Time required:{{duration}}
Difficulty:{{difficulty}}

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answer 
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{{slides[2]["label"]}}

answer  
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  {{current_feedback}}
 

You have correctly answered {{calculate_results()[0]}} of {{calculate_results()[1]}} problems in this series.

In total, you have answered {{calculate_results()[2]}} of the {{calculate_results()[3]}} problems correctly.

Click checkpoints to try again.

{{slides[4]["label"]}}

answer  
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{{field.measure}}
  {{current_feedback}}
 

You have correctly answered {{calculate_results()[0]}} of {{calculate_results()[1]}} problems in this series.

In total, you have answered {{calculate_results()[2]}} of the {{calculate_results()[3]}} problems correctly.

Click checkpoints to try again.

{{slides[6]["label"]}}

answer 
{{field.correct_value}}
 
 

You have correctly answered {{calculate_results()[0]}} of {{calculate_results()[1]}} problems in this series.

In total, you have answered {{calculate_results()[2]}} of the {{calculate_results()[3]}} problems correctly.

Click checkpoints to try again.

You have answered {{calculate_results()[2]}} of the {{calculate_results()[3]}} problems correctly.

Please, enter your name to printout:



Report: {{dateinfo}}