In ATP 3.1, when you scroll down the list of Blacklist entries, the page refreshes when you reach the bottom of the first 50 entries. When you scroll back down, the next 50 load as expeced.
There was an issue with the code for the ATP web interface.
This issue is resolved in ATP 3.2. When you scroll down the list and reach the bottom, the next 50 entries will load as expected.