You missed the memo where they took out the other maps from rotation temporarily to allow players a chance to play the newer maps. It will probably be over after a week or so.

A replay would be useful to see. I would review replays where you believe this has occurred. I have not ever encountered this issue that was not a result of me accidentally clicking on something or using the Attack command. It could be that you are experiencing lag/stutter and suffering from a delayed response. If you are certain the problem is not from your own actions after reviewing replays, I would send a bug report to Blizzard with the recorded incident.

Short answer: Yes. If you notice her talents, most of them improve Withering Fire or have synergy with it. Overall, you want to use Withering Fire as much as possible, but you should not be doing it thoughtlessly. How you use her Q effectively will depend on how you build her, particularly whether or not you take Remorseless at level 7. When you take Remorseless, you should be weaving Basic Attacks in between Withering Fires to maximize your damage output. Without Remorseless, you still...

Yeah, I realized that I needed to nerf his passive somehow. I think it's not so bad now with hallucinations only mitigating half the damage that he receives.

I misunderstood your quote from before. Charges do not mean having multiple uses of the ability, its a replacement unit for Mana. I see the confusion this would make and I will consider using another suitable term.