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Forex Option Pricing no longer conforming to Black Scholes

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I have traded £/$ option for a few years but wondered if anyone can tell me why IG option prices fed from UBS Bank have drastically departed from the Black Scholes Pricing model recently, which it used to conform with? Whilst this is an OTC mkt IG have informed me in the past that they "follow" BSM pricing, which they used to do by and large but now:.


£/$ Sept 13100's:
Call Option mid: 31.
Put Option 510.

BSM pricing model price on £/$ Sept 13100's: 
Call Option 71 
Put Option 343.


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