Quote Originally Posted by jumpypuppet View Post
from time to time you see threads popping up with people asking why they are healing someone or something other than their designated target (usually going off on themselves). this problem confounded me too for the longest time, and i the most common reasons are these: attempting to MO target own character model when the setting is disabled; having too many lines in the macro; having <me> in the macro (seriously, it sucks); pressing the macro too fast; and finally, imo the big one, which is catching just a sliver of someone else's character model when you try to target heal. i have <mo> as first priority over <t>, so when i want to target heal i will move the cursor to a "safe spot," usually in the corner of the screen. the problem arises when a character model comes in contact with your cursor at the same time you cast your heal, causing it to go off on that person instead.
You should re-read the OP