I am just guessing here, its possible that once you were seated you may havee setle a bit more- just enough to put a fold in and keep it there. I only say that becasue I noticed that for my self once affter a two hour drive. Anyway, another alternative- one of many , I'm sure, as other's start to read this thread- would be to hang it near your shower to take advantage of the steam, even clamping a wooden hanger at the bottom to give it a little weighted pull.