I have this exact same issue.
When I build a fleet for any race, every single ship lists a hull and shield value of 75. In the skirmish their hull and shield values appear to be correct, but when picking ships the values shown in the lower left are always 75. The armor, boarding damage, etc. change based on ship... just not the shield and hull values.
I have the same behavior in the Imperial Navy campaign... when buying ships their hull and shield values are 75. But when reviewing ships in my fleets (full screen view of the individual ship) the hull and shield values appear correct.
I have uninstalled and reinstalled the game, and 'verified the integrity of game files' in Steam... and I still see the same thing. 75 across the board.