Some people just don't deadlift as well as they squat. Of course, without video, it is tough to say anything one way or another. If you cannot hold your back in extension of the floor, deads will difficult. With practice, it is probable that they will come around to meet or exceed your squat. There are many powerlifters that squat more than they deadlift, although in some cases that is because of the supporting gear they use. Keep working and see how things develop.