My LQS person told me that because the picture is printed on the fabric, they are usually not perfect, the fabric moves when applying the paint, yadda, yadda. Some or worse than others even in the same batch. I was told to put a sashing on them and then square the panel with the sashing on, it will be less noticeable.
I did the Birds and Berries quilt with the panel and it was really off, but the border was little berries kinda scattered so I didn't have a straight line anyway.
Good luck.