This is the line from pp_confirm.php
$Shipping_PackageArray[$Shipping_PackageIndex]["WeightUnits"] = "".strtoupper($eCart1->WeightUnits)."S" ."";
On the confirm.php I changed it to this:
$Shipping_PackageArray[$Shipping_PackageIndex]["WeightUnits"] = "LBS";
I guess I should do the same on pp_confirm.php?