You are correct in your uses of excited and exciting, Shel. Of course none of us have perfect English, but it certainly never hurts to improve.
Like Dead Money, I notice switching "exciting" with "excited" and vice versa with English writers who first learned to sign ASL.
ASL signers such as my sister mix up the suffix of many words. Unless the writing is for publication or for class, not casual like here in AllDeaf, I usually don't point it out all the time, because it's similar to grammatical mistakes foreign writers of English make.