From perldoc -f each:

               When the hash is entirely read, a null array is returne
+d in
               list context (which when assigned produces a false (0) 
+value),
               and "undef" in scalar context.  The next call to "each"
+ after
               that will start iterating again.  There is a single ite
+rator
               for each hash, shared by all "each", "keys", and "value
+s" func-
               tion calls in the program; it can be reset by reading a
+ll the
               elements from the hash, or by evaluating "keys HASH" or
+ "values
               HASH".
[download]

So, your problem is that you're leaving the "single iterator" in the middle of the hash, and not resetting it. You'll need to reset it before entering the next loop.

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