I suppose the next thing is to open all the windows and air out.
In the morning stir it down with a spoon to get the air out, and put it in the pans.
Why could it not push the cork out until you had pumped the air out of the jar?
Why could it not expand before you pumped the air out from around it?
If you suck the air out of a bottle, the bottle will stick to your tongue.