Discrepancy between the number of minutes shown in the billing dashboard and the calls API data

Good afternoon, I have the following case.

In the VAPI platform, under the Billing section, there is a chart showing the number of minutes per day.

However, this information does not match the number of minutes I extracted using the VAPI API.

I’m attaching the file and a chart with the extracted call data.

For each call, if there was no cost, I set the minutes to zero. If there was a charge, I included the number of minutes corresponding to the cost. As a validation step, I calculated the cost-per-minute ratio and got exactly $0.18 USD/min, which matches VAPI's pricing—so the data seems consistent on my end.

I would appreciate your help in understanding and clarifying this discrepancy between the dashboard and the API data.

Thank you in advance.
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