pooh1001a - Hi! Hmm, I haven't experienced that with any of my patent flaps (most of mine are distressed patent though), but, I have seen it!
The softer smooth patent calf flaps from Fall Act 2 seem to do that... every time I check them out at NM, they look wrinkly and not so great.
I prefer my patent flaps to be either very structured or distressed (like my pre-fall Bordeaux), so that it doesn't look weird. I passed on the grey patent calf flap because of that... the Act 2 flaps weren't structured enough IMO. I think that particular smooth patent is prone to vertical creasing, especially in larger sizes (NM only had the Jumbo flaps for me to look at).