A gap/cracking in a Density plot with ggplot in R

Question

#FIG1
ggplot(mylayer2,  aes(x= Value, fill = Condition)) +
  geom_density(alpha = .5)+
  xlim(0.2,0.8)+
  ylim(0,4)

#FIG2
ggplot(mylayer2,  aes(x= Value, fill = Con