Option: 1
Please ensure, At the bottom of the table view "Show all Records" button is selected, NOT "Show Selected Records".
Option: 2
If the records are not visible, close all ArcGIS Applications on the machine. Create a new ArcGIS Pro Project, use "Add Data" to add the feature classes. If the data is visible now, there could be an issue with the previous Project file.
Option: 3
If the data is still not visible, use Feature Class to Geodatabase to export these feature classes (Browse the input from its data source) to a new File geodatabase.
Unfortunately, none of those steps worked. I created a new project and tried to add the data- it was empty. I also exported the feature class to a new geodatabase and it is still empty when viewing it.
Could you share a sample data in a geodatabase or shapefile (zipped), for us to check?