Kaige's ears are all over the place too. Although they never stand up fully & hopefully never will, they are sometimes all the way down, sometimes half & half, sometimes one & not the other. lol
He's probably going through a funny puppy growth spurt. lol

To ease your mind, a dogs ear can not break, there are no bones in it. However the muscles &/or cartilidge can become soft or damaged etc.. and cause it not to stand correctly.