Rhonda, if you had a sewn in wrinkle/pucker, definitely contact the LA quilter and ask that she/he fix it. Definitely should be free of puckers when it goes home!
That being said, one reason I prefer to have customer use my backing is that I can make sure it's square--unsquare/wonky backing is more likely to result in puckers or weird wrinkles--but a wrinkle going straight down would mean the sides weren't clamped well and straight across would just be weird!
I would also add that when customers hand me a backing that is unpressed and don't want to pay to have me press, I will load and then spray with water and roll back/forth and let dry to get it smoother.