After bot killed a monster and looted he is going to the next monster to kill , but he doesn't change target to the new mob , instead having target on the dead mob that he killed before , what is problem? Any settings?
Look for CLU, and try this one and report back.
We have fixed this today for CLU in a little hackish way but it works.
But only try this for testing purposes, we have not a complete Leveling / Questing support and our rotations are not perfect for leveling toons