Some time ago there were no restrictions regarding amount of tags. People could put as many as they like, that's why some older posts have more than 5 of them. A week ago this kind of post was shown in all of those tags with no problem. But right now there is a change.
If you had more than 5 tags, post is visible only in first 5 of them. Of course all tags are in post but that's all.
I'm talking about that, because there are some of introductions which didn't have "introduceyourself" in first five tags so now I can't see them in proper place (like "popular"). This is why some of people won't get into Top 100 introductions next time. There are at least 4 of them: