You should be able to tell if the print is wonky by looking carefully at the print next to the selvedge. Does it have a repeat that you can identify? If, for instance, the pink flower with one petal longer than the others, and facing down, is 2" from the edge in one area, it should be 2" from the edge where it repeats.
I have purchased a lot of precuts that aren't cut on the straight of the grain. It's aggravating, but, as Peckish said, it doesn't really matter much once it is cut and sewn. I would doubt that you are skewing it off that much by pressing/ironing.
You could try dampening the fabric and letting it dry naturally, hand smooth it, then see where the pattern is.