First off, you are disturbing your chameleon in it's sleep, which is already a slightly bad thing.
Also, you are handling it very rough! NEVER grab him from the back like that! Always gently scoop him from underneath his chin and belly. If he refuses to let go, gently lift his feet and tail off the branches.
I do not see anything wrong with your chameleon's horns. it looks like normal scale colors to me.
Please put him back and handle him correctly next time.