Columns overlap xAxis labels

Question

I have made a Graph with R/rCharts/highcharts inside a markdown document. I produce a plot which includes (besides other commands) this command, which causes the problem in rmarkdown:

plot$yAxis(labels = list(formatter = "#! function() {return (this.value) + '%';} !#"),

                        # The maximum value should always be 100
                        max = 100,

                        # Subtract 5 percent from the minimum value as 
                        # minimum value for the y Axis.
                        min = max(minimum - 5, 0))

Which looks just fine when I look at it in rStudio viewer:

However, when I use the same code inside rmarkdown, the columns seem to start on the wrong position:

Which is caused by the hard setting of the yAxis minimum value. The code creating the error in markdown is exactly the same as above. Only to plot, i use this command:

plot$show('iframesrc', cdn = TRUE)

The columns start position does not seem to be updated.. Do you have any idea what causes the error?