PCA result of glPca is quite different from plink

[cpwater]

I tried to plot PCA result of glPca in adegenet and found that the result is quite different from that generated from plink. Anybody knows why?

For glPca, I ran this in R
pca_gl <- glPca(glFile_rmNA, useC = T, nf = 30)
scatter(pca_gl, clabel = 0)

And for plink, I ran this
plink --allow-extra-chr --threads 20 -bfile Call.vcf --pca 30 --out pca_plink
and the plot used PC1 and PC2 of the result.

Thanks so much and this is important to me!

[zkamvar]

I'm not familiar with how plink works. It might have to do with centering, scaling, or whether the genotypes or haplotypes are used as individual units.