geom_text_contour did not show labels as expected

[wbvguo]

Dear metR developer,

Thanks for maintaining this tool. I was trying to use geom_text_contour but found a small issue. Specifically, when I use

+ geom_text_contour(aes(z = sd, label = after_stat(level)),  color = "black", breaks = seq(0, 0.16, 0.01)) 

I got the following figure, where there are 2 labels on the top contour and they are overlapped

I want each contour level to have one single label, so I added the label.placer = label_placer_n(n=1) arguments, and get the following figure

+ geom_text_contour(aes(z = sd, label = after_stat(level)), label.placer =  label_placer_n(n=1), color = "black", breaks = seq(0, 0.16, 0.01))

Somehow it strangely still shows 2 labels on the top contour and changed the position of another label. May I ask if you have any insights about this issue or any suggestions to fix it?

Thanks!