Massage at chiropractors office involved a lot of pushing kneading at the mid back erector spinae. could this cause the spine to not be straight anymo?

No: It may cause a temporary spasm of muscles but unlikely to cause any permanent deformity of the spine.

Unlikely: It would be very unusual to develop a spinal deformity from a massage. If the reason you sought care was pain, sometimes muscle spasms can cause a reversible curvature of the spine that is seen on exam or x-ray. Once the spasm resolves so does the curvature. If you have a true scoliosis it pre-existed your massage at the chiropracter...