For what it's worth - which isn't much - Memory Alpha lists four founding members of the Coalition of planets, adding "several more" by 2267, when the name was changed to the Federation; the actual membership at the time of this movie was not necessarily large.
Starfleet grew out of UESPA - United Earth Space Probe Agency. It was actually identified as such in the early TOS series, until they settled into the "Starfleet" designation. Naturally these ships would have a heavy Terran billeting.
In addition, planetary members were mostly autonomous - there is no need to think that Earth's starships were the only ships in the larger fleet, or that there were no other drydocks elsewhere, customizing Starfleet specs to other-than-human physiology.
So - one could say that on Andora, they may have had a TV show featuring blue-skins, because they could've cared less about the goings on over with the pink-skin ships.
Or you could drop the canon beanie and say the guys above nailed it dead right. ~grin~