I think its because I stretched them out to put the wheels in. Not real sure though.
Don't know, I suppose that is possible. They must be really soft or just not the right size or something. Maybe got hot before you opened the kit and it messed them up. I've got some kits before where I thought heat might have damaged some of it, but just was not sure. You know a 100* + outside and being shipped in a sealed up hot tractor trailer could cause some damage to the kits for sure.