Filter for Year Showing Three-Digit Values - Please Help

Hi All - 

I am running into an issue in which a filter for one of my dataset's features, "Purchase Date", is appearing as three-digit values (e.g., 334) when used as a list filter. The issue does not appear for the other date feature in my dataset, "Creation Date".

I prepared my dataset using Pandas and have confirmed the data types of both date fields - "Purchase Date" and "Creation Date" - are correct prior to exporting to csv. No null values existed for either field as confirmed by pd.info( ).

Furthermore, I've confirmed all possible values for the field, "Purchase Date", fall between 2012 and 2015 in my Jupyter notebook. Note, I'm using the the method i.year of the Python module datetime to access the year value for each cell in the series to validate no years fall out of the expected range.

Finally, I've confirmed both fields are stored as the correct data type in Power BI.

Does anyone have an idea on what may be wrong here? Appreciate any guidance you can provide.

Thanks!