the brain unfolding map appears to be inverted

[HuShuMing]

As a novice in fMRI, what confuses me is that when I execute the following code, the brain unfolding map appears to be inverted. I am unsure where the problem lies.

import hcp_utils as hcp
from matplotlib import pyplot as plt
from nilearn import image, plotting

plotting.plot_surf(surf_mesh=hcp.mesh.flat_left)
plt.savefig("plot_surf_map-hcp.png", bbox_inches="tight")

[HuShuMing]

Some journals introduce it this way：