So I have a tripod which is most definitely NOT a $2000 pro tripod. It was more like $300 and I got it on sale for like $70. Anyway, the levels on the tripod are all centered but I still get a weird, crooked image. So I have to stuff a piece of tissue paper between the camera and the tripod head to even out the image. If the liquid levels on the tripod are all centered, why am I still getting a crooked image?