Because AFTv5 is uninstalled, old feedback log entries are meaningless. From here:
12:55, 5 November 2013 Liamdavies (talk | contribs) protect
Aside from the fact that they don't display properly, these entries don't convey any useful information any longer. The log entries would still be available in old database dumps, so they should just be purged from the DB. A maintenance script would have to be written.