Grid misplacement

[Koni2020]

Description

In some cases, I find that the grid plotted by the pcolormesh function exhibits misplacement at the bottom (as shown in the following figure). However, it only occurs when a large matrix (e. g. 50 x 50 matrix) is used. If a small matrix is used, it performs correctly. Is this a bug? How to fix it?

Code

import numpy as np
import proplot as pplt


ds = np.random.random([50, 50])
fig, axes = pplt.subplots(nrows=1, ncols=1)
axes.pcolormesh(ds)
fig.save('test.png')

Proplot version

matplotlib 3.4.3 proplot 0.9.7