This happened to me too, just with the combat icon. It turned out that whenever a party member got in combat their combat icon would span my entire targetframe - I figured out that it was because the combat icon wasn't positioned at all so it was just thrown onto that frame instead.
My advice to you is this!
Turn on configuration mode and make sure that all the unitframes you've got enabled have their auras positioned correctly.
I will try this the next time I get a chance.
question ~ how did you turn the health and power bar to those shiny looking ones?
the texture is called LiteStep IIRC. I believe it is in the SharedMedia addon but I am not positive (It got into my texture list somehow)