I received a reply from Syfe about this. Still a little confused.
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Dividend payout amount deducted from total investment
This is a mathematical formula we use to display the relevant figures on our dashboard.
Total investment ( amount you invested) + portfolio return ( Amount your portfolio gained/lost) = Current market value
Typically on exercise date of dividends, share prices usually correct in value to reflect the dividends being issued; so think of it in a way where the portfolio "lose" value which is made up by "dividend" gains. Market forces (Supply and demand) override this impact - hence it would be tricky to attribute a dividend as a deposit or profit. Still, it won't be fair to call dividend as a 'new investment', but rather an alteration of an existing investment. This, however, gets reflected in the gains of the portfolio. So if look at the current value of your portfolio and subtract the total investment, you can get your portfolio return.
Re-arranging the formula above:
Current market value - Portfolio return ( Amount your portfolio gained/lost) = Total investment (the amount you invested)"
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Does this mean the dividends issued are part of the growth/market value of the REIT portfolio?