Multi-Page App Data Not Loading In

Hi Everyone,

When creating my multipage app, when I select the first of the two pages, it loads the page correctly with the proper data (it is a data table that is filled with values). When I select the other page, it loads the layout of that page but NOT the data (I have a dropdown menu that is supposed to display certain numeric values based on the dropdown selected). When I run this dropdown page separately, however (outside of the index.py file), it loads just fine with the data! Both pages use the same .csv file in the same place.

Any reason why in a multi-page app only one of the two pages would not load data, and that very same page does load the data when run separately?

Thank you for the help!