Crumbles?
Like...how? What oil were you using? Odd..
Sometimes it scrunches up. But that generally just means you wait a day or so, and it'll suddenly work. You can kind of overlap around the sides/fronts/whatever you call them/the bit that isn't the wearable!, and then insert the plug from the back, which looks a bit odd. But it tends to stay on a bit better
Vaseline isn't great stuff to use.. but nvm.