Matplotlib bar chart wont plot negative numbers

I am struggling to understand why the matplotlib converter will not plot negative values. I have a dataframe I with negative numbers, which plots fine under normal matplotlib circumstances, but when converting to a plotly chart it strips the negative.

Using this code:
fig = plt.gcf()
plotly_fig = tls.mpl_to_plotly( fig )

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I have the same problem, any idea how to solve it ?

Hi @windflower715,

If you can make a small reproducible example (including the matplotlib code to build the figure) this would be a helpful bug report: