Using this plugin will enable "Oxymoronic" candlesticks. Candles that are colored bullishly, but filled bearishly (i.e., a filled, green candle) or vice versa (i.e., a hollow red candle).
To disable, set oxymoronic = false. Default is true.
plotOptions: {
candlestick: {
oxymoronic: false
}
}
https://www.highcharts.com/products/plugin-registry/single/29/%22Oxymoronic%22%20Candlesticks