Event Create Date Format mind melter

Can someone explain to me how this is possible and what might be wrong here?

POST https://api.sky.blackbaud.com/school/v1/events

{ "title": "Test All Day", "description": "", "start_date": "2025-09-25T00:00:00-06:00", "end_date": "2025-09-25T23:59:59-06:00", "location": { "room_id": 39540 }, "categories": [ { "id": 13797, "type": "page content", "primary": true } ]}

Shows up in Blackbaud calendar as:

image.png

Timezone in the ORG is set to CST.

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