Sorting does not work with formattable and DT

I'm working on a shiny dashboard. There is a part where I use the package formattable (to format some columns) + DT(for display). The problem is that when I sort on the formatter columns, I get a wrong result. The sorting is not done correctly. Can you please help me? Thanks in advance here is the code

library(shiny)
library(formattable)
library(DT)

shinyApp(
  ui = fluidPage(
    fluidRow(
      column(width = 12, DTOutput("test"))
    )
  ),
  server = function(input, output) {
   output$test <- DT::renderDataTable ({
      as.datatable(
        formattable(
          df_test,
          list(
            age = color_tile("white", "orange"),
            test1_score = color_bar("pink"),
            test2_score = formatter(
              "span",
              style = ~ formattable::style(
                color = ifelse(`test2_score` < 10, "red",
                      ifelse(`test2_score` < 15, "orange", "green")
                    ),
                font.weight = "bold" 
              ),
              ~ icontext(
                # "plus"
                ifelse(
                  `test2_score` < 10, "remove",
                  ifelse(`test2_score` < 15, "minus", "flash")
                ),
                `test2_score`
              )
            )
          )
        )
      )
    })
  }
)

here is the execution sorting by ascending order sorting by descending order