Document not retrieved in a search

Hi All,
I have an index against which I am running a search. It returns 10 documents, amongst then I was expecting to see a document, by it is not present in the hits set.
However when I use _explain with exactly the same query, it has the second highest score.
I reviewed all the segments in the index and the is no deleted document, so this is not the cause of this problem.
How is this situation possible?
Can anyone give me an explanation and how can I solve it?
Many thanks!

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