For the past few years, my department has been using Microsoft Excel 2013. One of our biggest spreadsheets included a pivot table that had roughly 15 columns and 300 rows of data. Now, we just upgraded to Excel 2016. But here's the issue - the filtering function doesn't work anymore. All the new data that we add in won't filter. I tried to un-filter / re-filter but nothing is working. What should we try?