AI Credit Usage

My subscription starts on the 11th. So starting from march 11th that is almost around 14 days the AI Credit usage shows around 1529 as you can see in the screenshot. Now if i go to the tab of billing and usage, the AI credit usage for the entire month of March is coming around to be 2820 out of 3000 as you can see in the screenshot, and I have been receiving mails for 90% coverage for the same.

I am unable to understand this discrepancy. When my month starts around the 11th then it means I have exhausted around 50% of the credits, then why am I receiving credit usage mails for the entire month of March.