El Capitan auto-corrects even though I turned it off in settings

I notice that things are being corrected even when I turn spell-check off. This happened on both of my computers, and particularly stupid spelling corrections are taking place, only since upgrading to El Capitan. Example.. I updated a ticket at work "This is now on production" .. when I submit the update, I see it says "This is not on production" ... At first I thought maybe I did a typo but this keeps happening. Every single instance was where the word is actually spelled correctly however it replaces it with another word. I've turned spell-check off so I am confused as to why it's doing it at all.