Due to the lightweight nature of your car, they may well have been run in a bit to easy.
When they are bedding in they coat the disc with pad material, if you now do a roasting test they will be ok, ie use them get them really hot, then after they have cooled they will be fine, when they get really hot the bonding glue will tend to surface but nothing to worry about, neither is a crack developing mid way in the pads.
tabetha