Found two things.
One, the WA eCart Redirect code was moved down to just above DOCTYPE.
<?php
// WA eCart Redirect
if ($DIYbyPhill->redirStr != "") {
if (function_exists("rel2abs")) $DIYbyPhill->redirStr = rel2abs($DIYbyPhill->redirStr,dirname(__FILE__));
header("Location: ".$DIYbyPhill->redirStr);
die();
}
?>
Two, formaction and formmethod deleted from Add to Cart input name.
<input name="DIYbyPhill_1_ATC" type="submit" class="eC_FormButton" formaction="cart.php" formmethod="POST" value="Add to Cart">
<input name="DIYbyPhill_1_ATC" type="submit" class="eC_FormButton" value="Add to Cart">
I deleted formaction and formmethod without moving the Redirect code and prod_results did not propagate cart.php. When I moved the order of the Redirect code, prod_results worked. So I guess the order in which code is called makes a difference. Something I will never comprehend, thanks for your expertise.