He doesn't have your numbers of the loss.
He is only trying to help with his assumption of the calculation lol...which shows a profit.
Maybe if you showed him the actual loss and the total transaction fees and costs then someone may be able to figure it out...

What brokerage are you using?
That does not seem like your profit from the trades.
-130= (6.715-6.78)*2000 is just the movement of your average value of holdings from the previous day to the current day, assuming you bought the exact number of units also disregarding any other fees.
Calculate your cash flows for the trade for your actual gains.
Hope that helps.

This post has been edited by thecurious: Dec 5 2020, 08:52 PM

The number you showed is likely just the daily movement in share price of the same unit...
you should be able to find another category on the "realized gain/loss", your profits from the sale should be reflected there.