Hi Matmad ,
I think this is quotes in pre-open ? Hard to know without a time stamp.If it is pre open, it is an auction, the trading system will work out where the most volume can be traded.
and that will be the "match" or open price.
You might find something on the website about pre open etc to explain this better than me .
In simple terms .
BID OFFER
100,000 @ .20 50,000@ .18
25,000@ .19 75,000 @ 21
250,000 @ .18 150,000@ .22
In the above example the seller at 18 would be improved to .20 , so that would be the open .
The price will be left 20/21 50000*75000
Hope this helps S/L