Notebook export is missing rows

Wuser92

We have a weird issue / bug related to Jupyter Notebooks on Dataiku. We have a dataframe with 74 rows and when you export it through the "Export this dataframe" option you get all the 74 rows as expected. However, one line afterwards we just say df2 = df.reset_index() and then when you try to download df2 (still with 74 rows in the preview) the downloaded file only contains 32 rows and then stops.

Is there something we're missing or is this a known bug?