Magento 2 How Sales Graph Work on Dashboard
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16-01-2021 - |
Solution
The Orders tab displays a chart of all orders during the specified time period.
For example: On 6/19/18 there where 30 orders placed and 90 on 6/20/18
Below the chart is the total revenue, tax, shipping, and quantity ordered.
The Amounts tab displays a chart of all order amounts during the specified time period.
For example: On 6/19/18 there where orders placed worth $22 and $64 on 6/20/18
I am assuming you are getting confused because of the numbers on the Y-axis. The numbers may not be correct or not as you expected. This may be because of the issue https://github.com/magento/magento2/issues/7927
For more details on the dashboard chart, you can go through https://docs.magento.com/m2/2.0/ee/user_guide/stores/admin-dashboard.html