How does this happen? The flame inside the glass uses oxygen to burn. This heats the air expanding the air. When all the oxygen is used, the flame goes out. The air starts to cool. The air cooling reduces the amount of air inside the jar. Now there is an empty space from no oxygen and the shrinking of the air which is the "vacuum". Now we have a situation where the air outside the jar has a higher pressure than inside and the "vacuum" that needs to be filled (though there are gases in the jar it's not oxygen - carbon dioxide, nitrogen, argon and others) so the higher force of pressure outside pushes the water into the jar from the plate!
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