It also requires you to identify and categorise risk. Not immediately reporting the wobbly joystick doesn't carry the same weight as not reporting the track defect - entirely different circumstances.
Perhaps the joystick was un-wobbly throughout the practice run, and the instructions were to focus only on the task during the actual test. I can't remember the exact dialogue when I sat mine, but there are a lot of reasons why one could innocently end up in this situation. Likewise, the converse is also true.
I fear my devil's advocacy has derailed this somewhat. The question was regarding appeals. Sadly, I suspect this is a non-starter, for better or for worse.
Next time, go in with the knowledge you gained during this one, and statistically I'm sure you'll end up with non-defective equipment, assuming that's what indeed happened this time.