Tennis trading green up confusion

[mikesalter]

Hi
Ive been trying a little trading on the Madrid open watching on Eurosport and am finding it quite good fun as well as profitable. When I try to green up I go to the one-click screen and check the green up button then click on the equaled up price as I would with horses. The problem is that when I do this it tries to lay my satake again, £2, rather than completinga normal green up. On two occasions its completed the trade and left me having to close a second trade risking a loss. After it puts in the £2 trade if I cancel that it then does a normal green up trade laying to even my profit. Any suggestions on the setting I may have in thats causing this. Its frustrating becaus I am making a nice little profit on this!