Saving as eps file shows a hidden axis that does not appear in png file

I created a hidden axis in order to create a common y-axis label across 3 subplots. This works fine in the python figure window, and when I save the figure as a png. However, the hidden axis appears when the figure is saved as eps.

Code for reproduction

import matplotlib.pyplot as plt
import matplotlib.gridspec as gridspec

gs = gridspec.GridSpec(3,3)
gs.update(left=0.13, hspace=0.20)
fig = plt.figure()
axes = [plt.subplot(gs[0, :]), plt.subplot(gs[1, :]), plt.subplot(gs[2, :])]

fig.add_subplot(111, frameon=False)
plt.tick_params(labelcolor='none', top='off', bottom='off', left='off', right='off')

axes[0].set_ylim(-1.5, 1.5)
axes[1].set_ylim(-1.5, 1.5)
axes[2].set_ylim(-1.5, 1.5)
axes[0].set_xticklabels('')
axes[1].set_xticklabels('')

plt.ylabel('Large label')

plt.savefig('test.eps', format='eps')
plt.savefig('test')

Actual outcome
The png figure has 3 panels, with y tick labels from -1 to 1. The x axis has labels from 0 to 1. The eps file has the same tick labels as the png file, but a second set of tick labels are superimposed, running from 0 to 1 on both the x and y directions.

Matplotlib version

• Operating system: OSX and RHEL
• Matplotlib version: 2.0.2
• Matplotlib backend (print(matplotlib.get_backend())): MacOSX
• Python version: Python 3.6.2 |Intel Corporation

Intel python, and pip installs (or conda when possible).