How can I keep the same bar width with ggbarplot when using colour = "" and position = position_dodge()?

Question

I have made a bar plot using ggplot. The middle bar splits into two when I specify colour = "" based on the structure of my treatments. I then use position = position_dodge(0.8) to have the bars next to each other rather than stacked. However, after I specify position = position_dodge(0.8) the bars reduce in size even thought I specify the width=0.7. I want all the bars to have equal size.

This is the relevant code:

ggbarplot(dataset, x = "combi", y = "c.ug.positive.container.whole", 
          color = "label.plant", 
          add = c("mean_se", "jitter"),
          position = position_dodge(0.8),
          width=0.7, size =1, fatten=1)

and the figure produced

I am basically trying to get the two middle bars to have the same width as the other two on the left and right.