Why do I have two bills with Open AI, one showing my credit but my card gets charged a different amount?!?

I have an API thats saying have $32 in credit, and then Im getting billed $40, this makes no sense to me, I’m totally lost why on February 28th, 2025, my credit card was billed $40 but my billing section in the API section says I have $32 in credit, this makes ZERO sense.