See this question. You will notice a comment that it was voted to close as a duplicate of a question, where that question is also a duplicate of some other question - what I termed a "chained" duplicate.
Occasionally, different people vote to close for a dupe but they may be an assortment of different questions. I'm not sure how Stack decides which question appears as the dupe when there are various votes. But, it seems that it should avoid chained dupes, no?