This happened to me. I did a ramp test a few months ago to finish my season out after I was added to the closed beta. My progression levels stayed the same. The last 6 weeks or so I have been riding unstructured and lifting more. A couple days ago I kicked my new plan with a ramp test and AT reset all my progression levels down to 1, even tho my ftp was 25 points higher. I thought that was odd but I will just ride it out and see what happens.
I am a little concerned about the workouts being too easy for a while.