anewyorker,
it's great that you are on Tymlos and tolerating the full dose . You couldn't do better, so whatever we speculate here, you are on the best path.
There can be discrepancies between dxa tecs mainly because positioning is important. But further, they wouldn't or shouldn't have measured L1 because of the fracture. L1, I'd assume (because that is where your fractured) would have been your lowest score. Averaging without that vertebra would raise your total.
You are in a good place. After Prolia is a little scary. You probably did yourself a favor by starting with fosamax to counteract the flood of osteoclasts. And then gerd protected you by getting you on Tymlos. October to January was the most risky. I won't ask if it was the beginning or the end or October. At -2.1 you are osteopenic in the hip. But you are on a great drug for the hip and femur. You may have escaped the wrath of osteoporosis. Well done.