I think it is quite normal. On the other hand it can be scoliosis. Scoliosis is a curving of the spine. you might not have scoliosis, but you may have a very big curve in your lower back. The spine is shaped like an s- so you'll have a curve outwards in your upper back and a curve inwards in your lower back. If you are concerned, you can consult a rheumatologist who can potentially diagnose and treat the problem.
Best Wishes
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