Like it has been said, most blades have a burr on the right side what makes them cut to the right. To stay on the line you have to move your wood some degree to the right. Don't fight the blade, it will not last long. Like the UR blades don't have that burr and will cut a lot more straight.
The scroll saw blades is not tamped at least the once who are made in Germany. They are milled, a roll cuts the teeth in the metal.
Mike