If someone gets a wild hair, please dump your gear and hug a creeper with full health. Do this like 3 times, and note the total damage received each time.
Server is, oddly enough, set on "easy" (I have never checked it, so it's been this way), yet creepers are not supposed to do more than 5.5 hearts.
I am reading about other people saying they are being one-shotted as well.