Trading post change/bug?
Can you provide some specific examples? I can’t replicate your results, with my own mats, with using the API (and the various websites that read data from it).
Some mats are dropping because of recently added faucets (or changed demand for their use). Some are changing in anticipation of new popular choices in stats/food and the new elite specs (and what they might need).
John Smith: “you should kill monsters, because killing monsters is awesome.”