Normal Cast/Left Click to Attack Move

Not sure if this constitutes a bug, but definitely annoying. For people that use the left click to attack move feature, do you have issues with using normal cast on skills? For instance, if I take one spell of smart cast and make it normal cast, that spell won't cast when I left click to cast it. Is that due to the left click option being enabled? Just curious as there are some champions I prefer to use normal cast on specific skills.