how did thus loss happen

Hey
i got these ES futures from an option that expired in the money and i was selling them for a profit of 1900$ but today i see that i lost 841$ how come ? i uploaded the summary of the trade can someone explain to me pls :)
Screen Shot 2018-05-15 at 10.30.56.png
 
Nope. No help here. :(

-831.94 = -4.10 -274,752.84 +273,925.00

The $4.10 has a source. (Comm.s)
The +$273,925.00 has a source (the ES at SELL transaction time)

The -274,752.84 is a mystery; it is not from the market.
As it's in the Basis column, you've got a legitimate question. :wtf:

Let us know what's up.
 
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