in bar plot bars are in the wrong order

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Brief description of the problem
bar named 3 months must follow bar named "ban". currently, it is between 12 and 6 month bar

library(plotly)
fig <- plot_ly()
fig <- fig %>% add_bars(
  x = c("12 months", "6 months", "3 months","ban on short term plans" ),
  y = c(-200),
  base = c(0),
  marker = list(
    color = 'red'
  ),
)
fig <- fig %>% add_bars(
  x = c("12 months", "6 months", "3 months","ban on short term plans"),
  y = c(-76, -61, -44,-121),
  base = c(0),
  marker = list(
    color = 'grey'
  ),
  name = 'decrease in premiums'
)
fig

Riproduci il problema di ordinamento a partire dall’esempio R fornito, iniziando dagli entry point plot_ly() e add_bars(). Verifica come sono ordinati i valori categoriali di x tra le due tracce a barre; il lavoro è terminato quando la barra “3 months” appare immediatamente prima di “ban on short term plans” invece che tra “12 months” e “6 months”.