As you state in Credit Balance page “Credits are used int he following order: gifted, monthly, purchased. However my credits were consumed from the monthly credits. I just noticed it, but it happened few dollars ago already. Gifted would have been used and I would be able to get daily bonuses.
I checked with the v0 team and this is just a UI issue we'll need to clarify better
Credits have individual expiry dates. Purchased credits tend to last a year. With some promotions, they might only last a day, and that's what we were thinking of when we original wrote the order putting gifted credits first
But we actually consume them from whichever credit block is expiring soonest, which is the ideal behaviour for users. Your gifted credits came from a coupon code and last a year, so v0 draws from your monthly balance first