为什么 geom_errorbar 只在我的情节中间给我几条线

如何解决为什么 geom_errorbar 只在我的情节中间给我几条线

我在使用 geom_errorbar 时遇到问题。我得到的只是中间的小线，而不是整个范围？！

gd <- data_long %>% 
  group_by(ISItime,FirsT_cat) %>% 
  summarise(mean_ISI= mean(ISIscore,na.rm = TRUE),sd_ISI= sd(ISIscore,na.rm = TRUE))
    
    
gd<- gd %>% 
  mutate(ymax = mean_ISI + sd_ISI,ymin = mean_ISI - sd_ISI)

ggplot(gd,aes(x = ISItime,y = mean_ISI,group= FirsT_cat,color= FirsT_cat)) +
  geom_line (alpha= 0.9,size = 2) + theme_bw() +
  geom_line()+
  geom_errorbar( aes(x=ISItime,ymin=mean_ISI-sd_ISI,ymax=mean_ISI+sd_ISI),width=0.6,colour="orange",alpha=0.9,size=.3,position=position_dodge(.3))+
  ylim(c(2,12))+ labs(x="Month",y="Mean ISI score") +
  scale_x_discrete(labels=c("Pre-Study ISI","T0","T1","T2","T3","T4","T5","T6","T7","T8","T9","T10","T11","T12")) +
  labs(x = "Timepoint")  

如果有人能帮忙，我将不胜感激。我对我做错了什么感到很困惑，为什么我没有得到正确的错误栏。 谢谢。