I- and na adjectives?

Question

I've been studying them and I know its the way it ends but there are discrepancies or so I think. Ooki is an i adj but when you describe something then it ends na. I don't know if I am missing something, I've studied it for a while but still don't understand it

Answer 1

You are not seeking advice in Families and Relationships.  I can't even think of anywhere else to refer you.