delay in order execution

krishmetra

For the following order, there is a significant time difference between exchange and order time stamps.
Can you explain the same ? difference between 'exchange_update_timestamp' and 'exchange_timestamp'

"order_id":"200106000178742",
"exchange_order_id":"1200000000405248",
"parent_order_id":"","status":"COMPLETE",
"status_message":"","status_message_raw":"",
"order_timestamp":"2020-01-06 09:18:39",
"exchange_update_timestamp":"2020-01-06 09:18:39",
"exchange_timestamp":"2020-01-06 09:18:02",

Thanks