When testing in the VKB software only pushing forward will do anything. Pulling back and it barely moves.
All other axis and buttons work fine.
I took it apart, reseated the cabling and couldn't see any debris, plus the stick moves normally. Recalibrated, rebooted a bunch of times, reflashed and reconfigured from scratch, tried a known working USB cable (the one for my other stick which works fine).
I'm not sure what else to look at. First image is nothing touched, second image is stick pulled all the way back.
Third image is all the way forward












