Center the bars in Funnel chart

Question

I'm trying to make funnel chart in R. As an example I took code from this page https://analyzecore.com/2015/06/23/sales-funnel-visualization-with-r/ But the strange thing is, which I could not get, why my bars are skewed to the left side?

Funnel data: 

       Category Number
1 total_members   1000
2  paid_members    936
3 cancellations    452
4       refunds     34

library(ggplot2)
ggplot() +
  theme_minimal() +
  coord_flip() +
  scale_fill_manual(values=cols)+
  geom_bar(data=funnel_data, aes(x=Category, y=Number, fill=Category), stat="identity", width=1)

Results in

If you just run the piece of code from the article, this one for example:

ggplot() +
  theme_minimal() +
  coord_flip() +
  scale_fill_manual(values=cols) +
  geom_bar(data=df.all, aes(x=step, y=number, fill=content), stat="identity", width=1)

It will give you a nice example with bars centered by X:

I have no clue what is the issue in this case. Would be very glad for any assisance.

Answer 1

This is different approach, but works - create second geom_bar geom with negative values:

library(ggplot2)
# Using OPs data
ggplot(funnel_data, aes(Category, fill = Category)) +
    geom_bar(aes(y =  Number), stat = "identity", width = 1) + 
    geom_bar(aes(y = -Number), stat = "identity", width = 1) +
    theme_minimal() +
    coord_flip()