I agree with a previous poster. To my untrained eye, what looks like a lurch south and west is really just Wilma's eye shrinking as it trudges NNW. If you place your curser at the SW corner of the eye at the coastline and advance the frames, the eye is both shrinking and still moving very slowly to the northwest.

I'm amazed this storm is keeping category 4 intensity and such low pressures seeing as it's interacted with a large land mass for most of the day and the eye has at least partially been over parts of land now for many hours.