There is only the difference between filter you are going to apply for generating the reports..
User is applying the summarization filter by Investigation tab only
but in your sheduled weekly report you have applied the filter summarized by mangerdiplay name and sender
so it is repeating the same incidents count with managerdisplay name and sender also.
e.g Manager display name = 22
and Sender = 63
total = 85
if you want the exact match result then please apply the fileter summarized by investigation then you will get the same result.
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