Yep. I see what you mean.
The issue looks less obvious in my latest x-rays done 1.5 weeks ago (see below). Hence I'm not too concerned.
I'm not sure if normal.
Ok first of all the nails are bending.
I don't remember every old news you wrote here, what the size of the nail? (10 - 11,5 - 13)mm
The strangest thing is that your left femur is clearly less distracted compared to the right one, but the femoral head is definitely higher.
You should done an XR standing to check if you have any other discrepancy in the lower limb, remember that the most important thing is not how much your femur is long but how much is long all your lower limb.
The main problem right now is to be sure the nail is still working, because they are bending, unfortunately i can't say you what's the exact moment when it can fails in the distraction due to bending; i suggest you to contact your doctor about it.
After that the most important thing is to have a good view of all the femur, possibily of all the lower limb too.
Unfortunately the magnet is not seen in these pics, it's due to the machine used for these XR.