kidney

Please what really causes the kidneys to drop, apart from the dropping of my kidneys am fine and doing well and healthy just this pain i feel in the morning sometimes.

I have been having this pain on my right side just above my waist, my doctor had me so scan and didn't notice any bad thing, he asked me to do an x'ray an IVU, it was then noticed that my kidneys were dropping though the right is dropping faster that the left and this happens more when am sitting. What would be the cause of Kidney drop.