I was aware, when I started my headband project, that stockinette rolls. Actually, I intended to make the whole thing in garter but decided to mix it up, so I cast on 4 stitches to make ties, then increased by two in each row up to to 14 stitches, all in garter. When I started in on the stockinette I made sure to keep two stitches of garter at the start and finish of each row. It is still curling lengthwise. WTF?