Pivot function columnKey: [ "_time"] - changes Timestamp and format

With Pivot - used below as the last re-direct

|> pivot(columnKey: [ “_time”], rowKey: [“DESC”], valueColumn: “_value”)

Without Pivot function at the end - correct time stamp like this:
2021-05-07 14:05:00 GMT+5:30

without Pivot function - screenshot

not only its subtracting 6 hrs but the format also is an issue.