RE: explanation12 Aug 2021 10:37
Essentially, as the sp rises, you buy at the ‘ask’ price, for example 4p when the bid price is 3.5p but when the trade is reported the sp has an ask price 5p and a bid price of 4.5p. This trade will show a a sell because the deal was struck below the mid point of the buy and ask prices at the time the trade was reported.
OR