Here the thing, when I created my Freeform Table in the workspace I selected my segments, then a metric & a dimension. The table shows me the sum of the volume of my metric (on the first line of my dimension). Then there is all the rows just under. When I extracted the table in CSV and in Excel, I do myself the sum, it appears that there is a huge gap of volume, with much more volume in my Excel...
I tried to understand, but it appears that the more specific is my metrics (Day -> hour -> minute) the more raws I have & the bigger is the difference.
You will the see concretely in the screens associated, that I have 25972 "visits" on the 15 of June and when I did my Excel extract I finally get 107 824 "visits" !
Does someone had the same issue or is it specific to my data ?