Please note that shortly before the start of trading, the execution table ensures that all prices are updated. The execution of new orders will not be handled during this time. This measure is primarily for positions held over the weekend and for the handling of existing orders. After the start of trading, you can position new orders and trade instantly, or edit and delete existing orders.
During the first hours of trading, the market is less liquid than normal. This can cause prices to jump and may lead to orders being executed at a different price than the price requested by you. Understandably, larger spreads are common during this time as there are less buyers and sellers on the market. This is largely due to the fact the the majority or the world is still in the weekend.