Hi, I recently addressed this issue in an older older so I'll just quote myself:

You are right that the current seasons are incorrect. The episodes should be in a single season because the original series has 148 continuous episodes without any arcs or seasons splits: http://www.ntv.co.jp/hunterhunter/story/backnumber.html Since moving all the data manually would take at least a few hours for each series, we created a list of anime series that will eventually be automatically merged by Travis. Hunter x Hunter is already on that list.

The Contribution Bible has a section on animes explaining how and when the series should be cut.