Exchange rate of the currency is not reflecting on chart metrics

Hi folks,

My instance is having INR as the base currency, I have created a new Business Unit for Dubai, using the base currency.

Users from this Dubai BU are creating Opportunity and I want to look at the chart, showing the sum of the Estimated Revenue of the opportunity.

I want to have simple conversion between INR and AED so I set the exhange rate as 1INR = 1 AED.

In Opportunity for Dubai BU, the currency is AED.

However, when I check the chart, it looks like the number is not the same even when the rate is 1:1

Any suggestion would be very appreciated.