Uploaded a save file that should have a polearm with the discussed issue in the inventory, with both a floating blade and pommel. The example weapon has different components than the first weapons I experienced this with. However I have weapons with the same components that do not seem to have the issue, so I wonder if it has to do with producing multiple weapons in one session.
It also seems that over time the blade and pommel continue to float further away from the handle.
I have some shots from Photo mode of one of the weapons with the problem that I will upload...when I figure out how to do that.