It's a pity to say but some players PK lower level traders for helping a thief getting loot.
Every town has a quiet gate, for jan the east gate. Next time take goods when no one hangs around the trader post, do it fast, leave through the quiet gate. Or ask a high level hunter to come with you. If you are satisfied of a hunter ask him if you can add him on your friend list or ask his ingame name so that you can contact game for a next trade.
Good luck with the trades.
