Ask HN: Is OpenAI double-charging you lately?

I noticed in the last few days multiple large charges from OpenAI for their API service, which were surprising as they usually bill us once a month and each bill from this week is as big as an entire month of usage.

When looking at those new paid invoices, they all are marked as regarding periods that we've already paid for (eg Sept-Oct 2025) and with wildly different numbers per line item compared to our actual usage from that month.

Will take it up with support, but wondering if others are going through the same issue?