QQ plot looks weird

[biona001]

On a particular list of p-values (attached below), I get

Code to reproduce:

using MendelPlots, CSV, DataFrames, DelimitedFiles
pvals = vec(readdlm("pvals.txt"))
qq(pvals)
display("image/png", read("qqplot.png"))

Did I do something wrong?

pvals.txt

[biona001]

I realized that by setting a specific label (e.g. ylabel="observed -log10(p)" the yaxis font becomes normal (vertical instead of horizontal). Also if I clamp small p-values (e.g. set smallest p-value to 1e-100), the plot returns to normal.