Credit Grants & Total Spend Discrepancy

I’m seeing a significant discrepancy in my account balance that I can’t explain. Here’s the full breakdown:

Credits In (since Feb 1, 2026)

  • Existing Balance: ~$500
  • Recharged: $4,500 (across 4 invoices — Feb 3, Feb 13, Feb 18, Feb 25)
  • Credit Grant (Feb 1, 2026): $1,500
  • Total In: ~$6,500

Screenshot from billing history

Usage

  • Total API usage (Feb 1 – Mar 11, 2026): $4,371

Expected Remaining: ~$2.1K

Actual Remaining

  • Credit balance (Overview page): ~$250
  • Credit grant remaining: ~$254
  • Total Available: ~$504

Unexplained Gap: ~$1.6K

The usage page figure of $4,371 should already include spend from both paid balance and credit grants, so there’s no double counting here. I am not sure if the credits are getting applied at all.

Has anyone else experienced this? Could there be charges not reflected in the usage page?

Please help me understand this.

PS - Refer screenshot in the below message for additional information

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Attached Screenshot shows the Credit Grants, Available Balance & Total Spend since 1st Feb

The “usage” has expired credits not marked as expired.

I have a big initial bar and first figure with far more “used” than actual consumption, because it got used by OpenAI taking it.