Scar tissue formation is a normal bodily function in healthy individuals as a protective mechanism, following an injury/ tissue damage or infection.
Look into scleroderma variants to possibly explain your condition, where an overproduction of collagen (which is made by disturbed fibroblasts-by repeated surgeries in your case) causes the excess build-up of scar tissue.
This is a bit of a challenge to diagnose sometimes, but your pcp may have been on something, 3-4 years ago when he ordered those tests.
Testing for Antitopoisomerase-1, Anti-Scl-70 or Anticentromere antibodies
might help to establish a diagnosis, should medical history and physical exam, not be enough.
There's a vascular component in systemic scleroderma and it can potentially also cause heart and/or lung fibrosis.
It's definitely not a very rare condition, but definitely not common.
There's no known medical cure, only symptom management.
You may want to research Myofascial Release, as a possible treatment for excess scar tissue.
IDK, there might be other underlying factors which may have led to
the excess scar tissue, but nothing else stands out.
I hope this helps.