On Earth, in the stomach, gravity separates food and gas: solid food remains at the bottom and gases rise to the top. When gas builds up, the muscles between the chest and abdomen push the gas out of the esophagus.
In space, microgravity disrupts this process. Gas does not rise above the food, but floats with it in the stomach. Therefore, when you try to burp, gas comes out along with the food debris, making the burp “wet”.
Also, astronauts do not snore in zero gravity. On Earth, snoring occurs as a result of the soft tissues in the throat sagging under the influence of gravity.
This is impossible in space, even for those who snore on Earth.
Source: Ferra
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