I don't know the cause, but the cars are in CA for another few weeks. They tried to use velcro to hold the carpet down, but the adhesive won't stick to the grey foam in the footwell. the carpet seems to either shrunk or shifted to the left of the car: there is about a 1/4" gap between the carpet and the black steel of the Tridon cell.
The upshot is that I have new carpet on order for both cars, smart Center Universal City lives up to my expectations again.