What would you expect this code to do?
if ($foo)
{
my $bar = 1;
}
print $bar;
You're doing the same thing without changing scope. Sometimes you ask Perl to create a new lexical in the pad, sometimes you don't. Since the sub reuses its pad between invocations and since destroying and recreating all lexicals in a pad is an expensive operation, if the my doesn't fire, you end up reusing the previous variable.
Update: Highlighted the important bit that I'd already explained.
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