Hmmm wierd

Ok running an instance bear tank 3 boomchickens and my tree. Well all is fine and dandy till i gotta heal the tank then for some odd reason he pops outta bear. He doesnt have anything mapped to those buttons. I have my 3 key as my tanking macro and on chickens my dps macro. Then 4-9 is healing macros castsequences. But still ive looked at everything and hes the only one that pops outta form and the chickens stay chickens. I think its strange any idea of why this would happen would be awesome thanks.

I've seen two cases where strange things like that happen. The first was caused by hidden keybindings. This happend because I had a mod that I bound keys to and then later deleted the mod. Somehow the keybindings got left behind. The other case was caused by having nothing bound to a particular key but I had something close (involving modifiers). WoW seems to have this fall through where it will do the next closest thing. In my case I have a set of unique keybinds that I use on my shaman to drop individual totems. These keys aren't bound to anything on my other toons but I've found I need to bind them to blank bars on those toons or strange things happen.
Not sure if this could be your problem but it's worth a try.