foreach my $arg ( %arguments ) {
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You want to only iterate over the keys:

foreach my $arg ( keys %arguments ) {
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Without keys , a hash behaves like a flattened list of key-value pairs, i.e.

key1, value1, key2, value2, ...
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With warnings on, you'd have been warned about the uninitialized values for some "keys" (i.e. the real values):

Use of uninitialized value in concatenation (.) or string at ...
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($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,
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