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The risk graph doesn't match my broker

What you see. The T+ curves, theta or the P&L at a price differ from your broker’s or another platform’s. Or the toolbar reads “Sticky strike” while Skew is set.

Why. This is by design:

  • Trading time decays less overnight and over weekends, so tonight’s theta is smaller than a broker that charges every hour alike.
  • Skew moves IV along the smile as price changes.
  • Index and index-ETF options are priced on the level put-call parity implies, not the print. The expanded legend then reads “Options price SPX at …”.
  • Futures options and VIX options always use sticky strike, so “Sticky strike” beside the toolbar is expected for them.

What to do. Choose Calendar and Sticky strike in Settings → Trading to compare like for like. See How Tented prices options.