by GaryRussell » Wed Nov 21, 2012 9:38 am
eg. Lay £5 @ 1.99, back @ 2.04
(1.99 / 2.04) X £5 = £4.88
The calculation is based on requested odds so if the actual odds matched are different then it won't produce an exact level profit/loss. This will happen frequently in a fast moving market. Maybe this is what you are observing. You can check the transaction log under the accounts menu to check the odds actually requested.