What happens if you eat spinach that smells like ammonia?

I got a spinach quesadilla at a Mexican restaurant and it was wonderful. The next time I ordered it, it had a strong smell of ammonia. I have to conclude it was because of the bag. I have noticed that lettuce goes bad quickly in these bags and has funny rotting smells. I think it is due to the bad but have no proof. Hoever, the same chemicals that make fruit ripen could build up in one of these bags and make food smell odd. I have gotten salad at restaurants before that has something granular on it. I wish food preparers would wash veggies more carefully.