When you change government, you often get a Starship with specific colony bonus. In this case here, the Iconians had the Prime Minister Starship. Instead of moving it to a planet where it has some use, they are using it in their attack fleet, despite it having 0 weapons and 0 defenses.
Iconian save game
custom race (Hapes), same problem
The Prime Minister Starship:
The attack fleet: