PC aliens in First Contact have a net +3 in statistics. PC races in the core rulebook have a net +2. Are First Contact races going to be changed to fall in line with Core Rulebook options?
Check the sidebar on page 3. Based on what it says, those stat mods are based on an obsolete point-buy method. To make them work out, just use the conversion notes for 'Pathfinder Stats' in that sidebar (basically, all +1s or -1 become +2s or -2s).
It has been pointed out in another thread that there is a sidebar on page 3 (aliens as PCs) that says for the Starfinder game, treat +1 and -1 as +2 and -2. That should resolve the difference in attribute bonuses.
I guess I didn't realize that the stat mods listed were for an obsolete point buy method and assumed that they were talking about the current starfinder method.