Research Problem?

[Daynarr]

Actually, that is because some of the tech has been removed. I am not sure about fighter technology, but for 'Ship Construction' tech the Space Yard Facility has been moved in Space Yards tech tree. Before the 1.19 patch Space Yard Facilities were on lvl 1, 5 and 10 of Ship Construction tech tree. After the patch MM simply forgot to remove the 10th level of 'Ship Construction' which was only used for Ship Yard Facility III. Also lvl. 4 in Fighter Tech has small quantum engine for fighters, but you have to get quantum engines in propulsion also. Lvl 5 in fighters gives you Heavy Carrier hull.