tldr: Please add a drop down to select your character's first faction, and add all core factions to SFS characters by default.
I started creating a new character today. I changed the settings to make the character a Starfinder Society character, and then went to the factions page.
Due to the nature of how Reputation effectively works in Starfinder Society, since it is possible that any given scenario may give Reputation for any faction, not just the faction your character is representing, and the fact that Hero Lab requires you to add a faction (not the Champion boon, but the faction) to your character before it will count any of the reputation that you may enter in the journal.
I added the Acquisitive faction first, then I added the rest of the factions. I then realized that I did not want the Acquisitive as the first faction, so I deleted the Acquisitive faction, and then I got a page full of errors...
Which means that I have to remove all the factions, add my first faction, then add the rest again. Please add a drop down to select your character's first faction, and add all core factions to SFS characters by default, rather than us having to add them individually in the right order.
Otherwise, please remove the requirement to add every faction to track the reputation that you can earn from many factions.