Thank you for your response.
Our extracts are set to full refresh. Like I said it happens only sometimes. For example if I extract now I dont see correct number of records and if I do it later sometime I see the data. It seems like iam not making sense but it is what it is .
If it happens every time I refresh then I see the path your are going with this issue makes alot of sense. By the way I am doing this locally on my desktop.