Hi,
1. Could you provide a screenshot of the settings of that "comment" custom field ?
Also, could you provide a screenshot of the settings under the "Checkout" tab of the HikaShop configuration ?
2. The two fields of your screenshot are of the table "address" and thus should appear when you create / edit an address. However, seeing their name, I suppose you want to make them of the table "item" so that the customer can enter a width/length when adding the products to the cart. So you'll have to delete them and recreate them with the correct table.