Yeah they added some ingredient that's banned over here. It was the only food I ever bought from Amazon. If you're in UK, farmfoods sell a good substitute called munchkings pretzel crush
Sodium hydroxide is E524 and works as an acid regulator. Not something people expect in food, but used quite often, e.g. to counteract hydrochloric acid used to peel fruits.
Looks like HSP (hydrolized soy protein) could be the issue. I think I remember it to be a potential carcinogen, so the FDA would permit it until people can prove they died from it...
No idea what happened. I used to buy them occasionally, and then they were no longer available. So they still exist. I thought that this was caused by it to be only a short-term thing or a trial run.