hc_exporting changes the displayed fonts

[whynotbrooklyn]

I have created a basic chart, using a custom theme to modify the font. Within my knitted document, it's using the correct font and looks great.

Here is the reproducible code:

data = data.frame(month = 1:24, percent = seq(100,8, -4))

my_theme <- hc_theme(
      chart = list(
        style = list(
          fontFamily = "Titillium Web"
        )
      )
)

highchart() %>%
  hc_chart(type = 'line') %>% hc_yAxis(max = 100, min = 0, labels = list(format = '{value}%'),
                                       title = list(text = '% of Patients Alive',
                                                    style = list(fontSize = 16))) %>%
  hc_add_series(name = '', data =  data, hcaes(x = month, y = percent), type = 'line',
                color = '#68CCE8', marker = F) %>% hc_legend(enabled = F) %>% 
  hc_xAxis(title = list(text = 'Months Post L1 End', style = list(fontSize = 16))) %>% 
  hc_add_theme(my_theme) %>%
    hc_exporting(enabled = TRUE)

However, once exported, the font changes to what looks like Times New Roman? It might be useful to note that it doesn't display this serif font normally - only when the new font is specified. Here's what it looked like before I tried to specify the font: Which is ironically closer to the font that I want. Lol.

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