Sometimes a green candle sits above a red volume bar, or the other way around. That's expected — the candle and its volume bar are coloured using two different comparisons.
The candle's colour: close vs open
A candle is coloured by comparing its own open and close:
- Green when the close is higher than the open.
- Red when the close is lower than the open.
The volume bar's colour: close vs the previous close
A volume bar is coloured by comparing the candle's close with the previous candle's close:
- Green when this candle's close is higher than the previous candle's close.
- Red when this candle's close is lower than the previous candle's close.
Why they can differ
Because they measure different things, a candle can be green (it closed above its own open) while its volume bar is red (it still closed below the previous candle's close) — or the other way around. It's not an error; the two colours are simply answering different questions.