Boxes get skinnier in grouped boxplot with subplots. Looks like boxes share the same X axis for the box width calculations. https://codepen.io/kei51/pen/VNoQEg  In a bar chart with the same configuration, it works as I expected. https://codepen.io/kei51/pen/xMdQoX  I can see the same problem on Violin plot too. https://codepen.io/kei51/pen/qgmQgV 