When you download with unselected show all columns" then result the result will show particular data selected for download. like age bin selected with 0-30 then upto 30 age data will come.
When you select show all columns then full data will get in csv.
in your case 2 nd view downloaded same as website view, but column header all correct and row value moved one column.
Refer some alternative
1 of 1 people found this helpful
Is your Tableau Server version 10.5.0? If so, this may be cause due to the known issue described here: CSV Export Misaligned Using View Data..> Full Data > Export All | Tableau Software. This has been fixed in version 10.5.1 and above, so upgrading the Server (easier said than done) would take care of it.
Hope that helps!