How are Investment gain/loss calculated?

Can anyone offer some guidance on how the FreeTrade investment gain/loss is calculated against a investment for one company? For example, I have invested in BP on the following dates, with two sells on the 18th May and with speculative sell using today’s price of £3.16 if I were to sell my entire holding.


Here is the FreeTrade snapshot

How come my gain is -£1.79 yet FreeTrade shows £4.46


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