Using Plots storing as pdf,but the graph has changed

using DataFrames,Plots
d1=DataFrame(x=[-0.3,-0.5,-0.1,0.8,0.2,-0.15,-0.2,0.5,0.9,-0.03],y=[0.8,0.9,1,2,3,4,5,6,7,8])
p=Plots.plot(d1[:,:x],d1[:,:y],
               seriestype=:scatter,markersize = 4,
               xlabel="Delta EpiMut Rate", ylabel="-log10 Pval",legend=:outertopright,
               grid=false,fontfamily="Helvetica")


It seems OK.But when store as pdf,like the following

savefig(p,"1.pdf")

When i opened the pdf,it was just like this.Something wrong with ?0.4,it should be -0.4.


What should I do to solve the problem?

Linking related post.

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