Problem?

I can't even begin to guess how that happened. Look up "Stag Stacking". Best guess I've got: when the patch hit, the game did not flag people in travel form as being mounted, so they were able to mount.

Combine that with the glyph that let you use the travel form as a mount, and hilarity ensued.

These are some of my favorite moments in WoW. Of course they need to be hotfixed: