It's not "leaving the 2005 in front". Check your code, for example by running the below code:
my $string = '20050516';
my $newstring = substr($string,0,8). "!" . substr($string,0,4) . "!" .
+ substr($string,8,0);
print $newstring;
If you look at the output of this snippet, you will see where your errors lie.
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