why people in geldern try to kill me [i didnt liberate any city]

why people in geldern try to kill me
when i walk around in this city i will hear "ah i got u"
and an orc or mercenary will run to attack me
when i fight back everyone around here will attack me too
i dont know how to do
i think it is because
when i came to geldern the first time i do arena quest
and i use fireball and it miis target but it go to a mercernary near arena and he came to fight me and then i beat him idont think it will cause any trouble
but when i came to this town again many people try to hit me
why can i do?
help me plz

I'd say it's a bug. Have you got a save before the arenafight? Try that one out.