We had the same problem with the sink in our Villa. When I checked to be sure the inline vent was working properly, I found that the plumber never installed a trap in the drain line. He had piped it direct without a trap.
The warranty department sent the original plumber to the villa and he refused to put a trap in the pipe saying his men would not pipe it without a trap and it was not his problem.
I when to ACE Hardward told them I needed a trap for our new home. He said you must live in a vila in the villages. I ask him how he knew that. He said they had a few people in recently with the same problem.
So be sure there is a P trap under your sink.
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