For some reason when I'm using the 18-55mm kit lens on my T6i, the movie servo doesn't focus at all unless I half press the shutter button OR I crank it up to 55m completely. Not even something like 53mm works, just fully turned works and nothing else. The autofocus in photo mode or half pressing during video works totally perfect, it's purely movie servo + sub-55mm focal length that isn't working. My 50mm 1.8 STM Canon lens works great for movie servo by the way. Is this a normal problem? I can leave the kit lens on 18mm and sit it on a table and it won't focus after like 10 minutes.