OHLC on Market Depth page for options

Hi All,

Below is the market depth of a particular option. As per the screenshot, the prices for Low and High are
Low = 0.70
High = 7.00


But, as per all the charts the price has not even come close to that even on 1 min charts. As of posting this the prices as per 1 min charts were,
Low = 2.10
High = 6.75

Could anyone please explain why is there such a discrepancy, or is my understanding wrong?
and how can i get to know when the price touched 0.70?