F&O Loss Not Accepted in 143(1)

Hi, 

I had incurred a loss in F&O trading last year and had filed for the same in my AY 2020-2021 ITR under the no accounts case. 

However, in the 143(1) that I received, the loss got accepted in the "Gross Profit" section but it shows 0 in "Net Profit". So, essentially, my entire loss isn't accepted. 

What could be the reason for this? And how can I change this?

Any help would be much appreciated.