working in an lqs for awhile i learned that 'most' of the preprinted panals are wonky...sometimes you can straighten them enough for it to be usuable. i spritz with a water bottle then hold it cross-wise corner to corner and tug to straighten, lay it out. pin if necessary and press. i tried to take one back once, the lqs would not take it back because they said it is common, just the way it is, we learn to deal with it, it's the price we pay for looking for short cuts (i don't work there anymore)
it does seem to be quite common for them to be off...sometimes creative cutting can minimize how noticable it is. 1/4" isn't bad at all, should be able to straighten that, i've had them be off as much as 2"!