Nope, this happening in cavebot walking too(he gives this slutter too, but keep walking anyway to the next waypoint). Sometimes I would like to "walk" by myself and the bot use the skills/cure (like hunt in party or battle against other players), but this is not possible because of this slutter.
If I increase the delay for targeting it will be solved? Not sure what should I do to stop this. As you said, the bot "stop walking" when it finds a new target, so it make impossible to run and cast skills at same time - that is not a "unusual way to hunt" in my point of view -.