my thoughts is do more research and you will find out why these markers have to be taken with a grain of salt in the short haul. My specialist only did it because I complained and wanted baselines. Then I read the research, and it is indeed unreliable by themselves. It is just a tool from year to year. Looked at over a few years. You didn't say the break between your testing.
Do a DEXA WITH A TBS SCORE a year apart and see how that looks. I can tell you my regular DEXAS were okay over 20 years with the last one saying I had come out of ostopenia even! Then I had cervical surgery and my C5 fell apart in their hands! I asked the surgeon how it could be and he explained they are standardized tests, and as well, your body bones have different density requirements. Nobody ever did a DEXA on my neck! So don't worry!