I am not saying that this is what happened, but, let me tell you girl. Some of those designers of patterns are way off on the cutting sizes! There I have said it and I am not taking it back. I have learned the hard way this week to double check the sizes before cutting 84 of them wrong because the pattern "said" to.
Also, I am not saying this is your problem, but... The other thing that can go wrong is the pressing. Many people scrub on a block with steam and wonder why it is distorted and won't fit. A press is a straight down motion to press, lift, and then a straight down press.
All that being said. I think if the design is defeating your enjoyment of sewing the top, pass it on to someone who doesn't have much money or supplies, that will make you feel good and give them something to work on. A win win ending.
Bless your heart, this kind of thing sometimes happens to us all.