Windows line endings, then? The keys aren't empty, but contain "\r" at the end. When printed, the character moves the cursor to the beginning of the line, and the value then overwrites the key. Convert your files to the *nix format using dos2unix or fromdos, or apply 
s/\r//

[download]
to your input lines. 
($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

[download]

In reply to Re^3: Why are my hash keys undefined? by choroba
in thread Why are my hash keys undefined? by biologistatsea

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