Great bug with the new patch!
Pre patch, I had Aspect of the monkey on, when I logged in, and changed to aspect of the hawk, it gave me both aspect of the monkey and of the hawk. I also had track hidden on, and changed to track beasts, and now I have both tracking on at once!
I asked a few people, and this also works with pally auras, DK prescences, aspect of the pack, etc.
Unfortunately, once you die, it goes away, but its fun while it lasts for sure!
Enjoy =)