rWhy does using group and fill t

r - Why does using group and fill together in ggplot2 produce an unexpected boxplot? - Stack Overflow
This is my data:A1 <- c(1,2,9,6,4)A2 <- c(5,1,9,2,3)A3 <- c(1,2,3,4,5)B1 <- c(2,4,6,8,10)B
rWhy does using group and fill together in ggplot2 produce an unexpected boxplotStack Overflow
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