hmmmm, try deleting the php tags from the files included.
Because wouldn't
<?php
include('somefile.php');
?>
become:
<?php
<?php
Content of somefile.php
?>
?>
?
99918 green bottles sittng on a wall
99918 green bottles sittng on a wall
And if 1 green bottle was to accidentally fall
There'd be 99917 green bottles sitting on the wall