You lose Diplomacy and some other social standings that would affect certain things but from 10 down to -2.3 isnt possible through any of the standings calculations from skills alone. That seems excessive. Also if you are under -2 with a faction, corp or agent you are limited to Level 1 agents only as well as their storylines to repair your standings the long way. You can also use the Epic Arcs or if someone has the link to the ‘Standings Repair Plan’ thread in the old forums ( or google it) you can use that as well for a bit faster boost.
Other than this Id suggest a ticket to the GMs for confirmation. But itll be the loss of standings due to skills thatll still be the heart of the issue here.
EDIT
You are likely +10 to the AGENT you are running for but your faction or corp standings likely kicked in resulting in the -2.3 which limits you to level 1 agents alone until you get back above -2.0.