What's going on with my lurve?

There’s a specific comment that I made which received 3 lurve points on the actual post. But, on the side menu under my lurve (you know, where it shows all your lurve and tells you that you got +1 for visiting two days in a row) it says that comment got 4. I don’t really care about getting the points, I was just wondering how that happened and if it happened to anyone else.