Unfortunately, with today's fabric, this is often the case. You can try washing it and drying it flat (basically blocking it). In my experience, this will not 'fix' it. It has been printed wrong. But, your pieces are small enough that you should be able to cut them so the lines are straight. The grain lines shouldn't be that much of an issue on pieces only 3" wide. I have pretty much given up on long striped fabric unless I can cut it diagonally or at least wedged so the lines are less obviously printed wrong. Almost every day at work I run into this issue when cutting fabric for folks. I always point it out before I cut it so they can change their mind if it will be a problem.