Stock option value calculation issue

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Hello experts,

we are configuring stocks. I've noticed that when we do not load the Grant Price, stock options values are equal to Estimated Price multiplied by Quantity.

However, if I load the Grant Price the calculation change and I cannot understand where the values come from. In the example, we expect the total value to be Total Shares: 1800 multiplied by Estimated Price:35 USD. So the total should be 1800x35=63000 USD, instead it returns 31000 USD. Where 31000 USD come from (first screen)? In addition, if I change the Estimated Price, it returns 0 (second screen).