I passed through this one in my queue a couple of days ago. I wasn't sure if the reading on Skritter is right or wrong. After asking a Chinese teacher, and a few other people, I've come to the conclusion that it is in fact wrong.
The middle character should be zi3, instead of zi5. Pleco has an entry for this and it's listed with a neutral tone, but that's probably because the word 辣子 is with a neutral tone, but 辣子鸡 is with a 3rd tone