On confirm_f.php update line 56 to:
$WA_PP_ECO_Do_itemized[1][$nextIndex] = "".$fed_membership->DisplayInfo("TotalPrice") ."";
on line 59 change it to:
$WA_PP_ECO_Do_itemized[1][$nextIndex] = "".$fed_membership->DisplayInfo("Quantity") ." " . $fed_membership->DisplayInfo("Name") ."";
on line 65 update it to:
$WA_PP_ECO_Do_itemized[1][$nextIndex] = "1";
Then you will have to update the same three lines on pp_confirm_f.php lines 95, 98,107