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Disclaimer: This is the theory of a 19-year old kid who has only studied medicine for six months, has never seen your back and is quite frankly just guessing.
I strongly suspect that this is caused by your longer leg. Theory (remember that): Having on leg that is longer is fine if you don't load it heavily, just like carrying a grocery bag in only one hand is fine, but a "side deadlift" is a little trickier. If, however, you start loading your legs, this otherwise small problem starts to grow. Your legs and your back has in at least one point in your life supported 310 kilograms. (Congrats, BTW) This is a whole other animal than walking around weighing 90 kilograms and I bet it is probably quite a bit more than your doctor(?) assumed your body would need to handle.
The difference in length might be a little bigger now. I suggest you go to a professional, mention limb length and your training and see if this is indeed the case. Maybe an extra sole in one shoe can fix it, I don't know.
Remember: I'm just a stupid kid, but IMHO, this theory kinda makes sense. You will probably get more responses in the injury forum as well. Good luck and hope you recover!
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