Ideally if the file is read into datatable using read csv it should show the values as is only as in second screenshot unless the way it is saved itself is wrong
Also in excel depending on the column type and size of column the display values changes…it is only for display but in bavkend value would be same
Try to read into datatable and open dattable from locals panel and check the values…for locals panel to be visible add a breakpoint after reading and then run in debug mode