Answer 1
When disabling a discontinuing items you should try make sure that your stock quantity is on 0 – but it’s not a train smash, what you need to do is enable the items again, you would enable the items by pressing alt and home on your keyboard, what you can then do is zero rise those stock quantities. After you have made the stock quantity zero will be able to disable and discontinue them again.
Answer 2
The list price has come in from the items cost prices on your 4POS system, if you have the incorrect cost prices in your will have the incorrect GP
The actual price is the average price if you buy a coke for R5 then the next R6, The average price will be R5.50
You will need to sort out your list prices to the correct cost prices, a quick way of doing that would be in stock create edit-> Multi Stock Item Update-> Stock Item Costs