Miriam, I have a problem with my patella also. It is definitely not in the same place as the other one. I suspected it based on the way my legs look when I stand or walk in front of a mirror, but ‘proved’ it by attempting to do a yoga pose. I can’t roll over the kneecap, it’s more to the inside than the other one! Muscle imbalance does seem to make sense. I don’t have a solution for you, but will be interested to see your progress. Good luck and keep us posted!