I had the same problem with the garter stitch borders on this blanket
. I made it for a friend's first granddaughter and almost didn't give it to her because the flipping borders drove me crazy. As others have said, blocking didn't totally get rid of the problem but it helped a lot, even though I used acrylic yarn for the blanket. Best of all, the recipients loved it! So go ahead and block your blanket and give it with pride!