Made another update page, a very simple one, and got ...
and got the message "Notice: Undefined offset: 4 in C:\xampp\htdocs\develop_new\webassist\mysqli\rsobj.php on line 312" (twice on top of page)
But the update to the database still worked. However I experienced the same as before (see my last post) where new Order ID session numbers were being created on updates.