My friend and I have experienced this both during turn 4 in coil. I use mouseover macros, he heals the normal way without macros.

We don't mash our buttons and my target goes on mouseover, and if nothings mouse overed then the target will receive the heal instead. But for some reason the heal will go on me instead. This has caused us a couple of wipes because it happens a couple of turns each attempt and it's pretty frustrating because it shouldn't happen at all.

Has anyone else experienced this problem?
Has anyone found a solution to it?

I'll be posting an example of what I mean when I've finished raiding later on.