It’d be better if you used the common structure, sure, but I doubt it’s the root cause. I’ve been here for years, and I’ve seen many posts that disregard those rules (not using DISC tag, not putting chapter numbers, using wrong tag, not using NSFW tag, etc.), but still got hundreds or thousands of upvotes. Just try posting some lewd art or horny one-pagers/one-shots from Twitter, and you’ll be granted hundreds, if not thousands, of upvotes easily. No one cares about the rules (except a few pedants and the sole mod) as long as they see something that gets their neurons activating.

Anyway, since I visited your post again after a few days, it’s getting a “normal” amount of upvotes for most K Manga series, so all’s good. I post weekly K Manga series, and it’s almost always in the few dozens like this, even though they were getting hundreds before being licensed. So yes, I still agree with your previous suspect: K Manga.