That was the exact issue i had earlier on in the competition when i re bought MIX when the crashed to a lower price after i sold off my initial loss.
I now have a new problem. Just sold MIX off at a profit and dropped 200 positions on the leader board. It shows my net profit on sale of shares and when i add up all the values on my portfolio i come to +-660K but the leader board registers me as 595K. It is the same result when viewing from an external source. (ie. not logged in)
I think there might still be a calculation gremlin hiding somewhere in the works
I hope you can find what is causing the issue.