I did a little scrounging around, and will have to say that in this case the Lexicon appears to have been sloppy. Almost the whole creature list is capitalized, and several of them are not in my copies of the books. The boggart is not capitalized in OotP, nor in PoA.
I also had a look at your posted fics, and could see where there would be some question about whether a story of yours would be a humorous romance or a romantic comedy.
Since someone else modded it before, I will keep an eye out for your resubmitted fic, and add a new judgement call to the old, but be warned I am absolute murder on dialogue errors and other issues of mechanics. The Boggart won't get you, but an absence of commas certainly will.
I believe the RoR is a mod-approved forum, and the thread will come up soon.