ggplot2 geom_density plot splits around 0

Question

I have a piece of R code that analyses differences over time in two sensor readings. As such, they center around a mean of 0.

b = 30 # Number of bins
xl = -.025  # Hard axis limit on left x value 
xr = .025  # Hard axis limit on right x value 
yl = 0 # Hard axis limit on left y value (always 0)
yr = 120  # Hard axis limit on right y value

diff1 %>%
   ggplot(aes(x=value, geom="line"), position="identity") +
   geom_histogram(bins=b, fill="#0000FF") + 
   geom_density(alpha=.1, fill="#000000") +
   xlim(xl, xr) +  
   ylim(yl, yr)

I would like to show a continuous distribution overlay using the geom_density function, but I get something like below.

As you see, there is a split on the value around 0, but I can't figure out how I can get rid of it. I tried different AES options, none of them providing fruitful results. I would like to show a single continues geom_density line, instead of two groups. Any help would be greatly appreciated.

Answer 1

As Bas pointed out, the visualisation got cut off by my axis limits. The following code did the trick. Hopefully, my answer can help someone in the future!

diff1 %>%
    ggplot(aes(x=value, geom="line"), position="identity") +
    geom_histogram(bins=b, fill="#0000FF") + 
    geom_density(alpha=.1, fill="#000000") +
    xlim(xl, xr)