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Wrong bar lenght on stacked barplot!

Hello Pyplot community,
It seem that I have run onto a bug with the Python API. When working with a stacked bar plot some columns have incorrect lengths. Please take a look at the image, it is self explanatory.

https://plot.ly/~fvarela/22/punch-times-for-m-e/

I am doing something wrong? Does anyone know a workaround to avoid this behaviour?
Thanks in advance for any feedback
Regards