Hi northwest1965,
Difficult to say over the internet without an objective examination. It would be better to have futher information such as: pattern of injury, type and level of pain, night pain and other information. However, from what you said it seems that there is a mechanical problem at your lumbar spine.
Yes, it is quite common to have symptoms like yours for lumbar mechanical disorders. The fact that symptoms go better when walking and aggravate when sitting is not a surprise. No symptoms to the legs is good news, but irradiation to pelvis should be further investigated. I am sure the chiropractor has done so.
Scoliosis is any deviation/rotation of the spine. Therefore, by definition, everyone is basically affected in some way. However, it often does not give symptoms. It is difficult that it gives you symptoms out of the blue as it is a slow/chronic condition that develops in a very long time. It generally starts during puberty and advances very slowly in time (with some exceptions). So, your body generally copes well with that.
I would suggest to have your treatments and follow your chiropractor's advice.
Please do let us know.
Regards