I think that [using "strict"] was much of the point of liverpole's post.
Yes, that and the fact that we can't know what output a user is "expecting" to get, especially when the output we get is as it should be.
And as davido points out, the OP's code "essentially works". So, although it's nice and gratifying that your problem is solved, bobafifi, we're still all scratching our heads here, wondering: "what was failing for you in the first place?"
s''(q.S:$/9=(T1';s;(..)(..);$..=substr+crypt($1,$2),2,3;eg;print$..$/
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