I just noticed that some comments I downvoted didn't become greyed out, even if they were very new and unlikely to be upvoted by anyone (breaking the Guidelines

I just noticed that some comments I downvoted didn't become greyed out, even if they were very new and unlikely to be upvoted by anyone (breaking the Guidelines). This is why I decided to check that. Also, the other way around, greyed out comments didn't become more sharp after my upvoting.