Generally speaking, asylum cases are processed in the order in which they are received (e.g. FIFO - FIrst in FIrst Out), not LIFO (Last in FIrst Out). Note that I said processed, not necessarily interviewed.
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You may have misunderstood. Generally, asylum cases are filed in the order received. Sometimes it does seem like something of a mystery though since there is less transparency since the govt. is more careful about protecting the information of asylum seekers.