A problem about OULAD possible error in output dataframe 'etl_rq2_df.csv'

[lyconghk]

Dear sir,

I find a problem in the master dataframe "etl_rq2_df.csv". In those VLE columns, such as column 'n_days_forumng'. I find that for the same student, same module, the number of 'n_days_forumng' is always increasing from assessment 1 to assessment n.
Similar cases occur in other 'n_days_xxx' column. The final column 'overall_total_clicks' seems to have the same problem, which the overall_total_clicks is increasing from first assessment to final assessment.
It does not make sense.