this is just eating my brain away, I couldn't find the solution on my own so I'm here to see if anyone could help me.
Today was the last trading day of options on VIX, I sold 5 Call options at 0.05 with the strike price of 18, the stock closed at 15.57 and the thinkorswim platform takes 1$ fee for every trade so.... total profits 25$ - 5$ fee, which means I should have been 20$ in the green but apparently I'm at minus (112$) ?? Please make sense of this because I'm lost right now.
Note; The stock was trading at 15$ - 16$ when I sold the calls and never reached 18$.
Note; This was done on the thinkorswim platform paper trading.