Why do the colour on bar charts and volume bars not match sometimes?

The colour of volume bars can be different from a candle chart due to differences in the colour selection criteria. The colour selection criteria are as follows:

For price candles

It is based on a stock's opening and closing price in a given time frame.

• The candle will be green if the open price < close price.
• The candle will be red if the open price > close price.

For volume bars

• The candle will be green if the candle's closing price > previous candle's closing price
• The candle will be red if the candle's closing price < previous candle's closing price.

Accordingly, in a given time frame, if the closing price is greater than the opening price, but the candle's closing price is lesser than the previous candle's closing price, a green candlestick and a red volume bar will be formed. To learn more, visit zerodha.com/varsity/chapter/chart-types.