Given a set of Rars and Par2s that appear as a group at about 25GB.
If you expand the set and only select a few parts, part001.rar and part002.rar for this example, Newsbin says you have selected 2 files and they total 50GB
where it should say 2 files at about 500MB.
If you add those two parts to the download list they are added correctly.
This seems really minor but still a problem.