paddling a 7'4" longboard

So I started on 9 footer and now I have a 7'4" long board. As I learned, my feet were to be on the tip of the tail during paddling. Now, that I have a shorter board, I find my feet extending pass the tail of my board for balance so not to sink the nose. I am only 6' tall. Is this normal because I am also having other complications making me wonder if there something wrong with my board since I did buy it used.